jablonskim

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Intro to Programming Languages

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Commands

Time of First Successful Submission: 2026-08-27 13:17:10

Command Arguments

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Command History

Time of First Successful Submission: 2026-08-27 13:18:22

The Root Path

Time of First Successful Submission: 2026-08-27 14:23:15

Absolute Paths

Time of First Successful Submission: 2026-08-27 14:37:15

Changing position

Time of First Successful Submission: 2026-08-27 14:53:41

Changing to an Absolute Path

Time of First Successful Submission: 2026-08-27 14:56:39

Relative Paths

Time of First Successful Submission: 2026-08-27 14:57:44

Cat

Time of First Successful Submission: 2026-08-27 15:06:36

Ls

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Ls All

Time of First Successful Submission: 2026-08-27 15:14:34

Find

Time of First Successful Submission: 2026-08-27 15:22:11

Piping Echo

Time of First Successful Submission: 2026-08-27 16:13:10

Piping Stdout

Time of First Successful Submission: 2026-08-27 16:13:44

Piping Stdin

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Intro to Cybersecurity

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Path Traversal 1

Time of First Successful Submission: 2026-08-30 16:14:46

Path Traversal 2

Time of First Successful Submission: 2026-08-30 16:16:32

CMDi 1

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CMDi 2

Time of First Successful Submission: 2026-08-30 16:17:53

CMDi 3

Time of First Successful Submission: 2026-08-30 16:18:42

CMDi 4

Time of First Successful Submission: 2026-08-30 16:19:30

CMDi 5

Time of First Successful Submission: 2026-08-30 16:20:18

CMDi 6

Time of First Successful Submission: 2026-08-30 16:21:01

Authentication Bypass 1

Time of First Successful Submission: 2026-08-30 16:21:44

Authentication Bypass 2

Time of First Successful Submission: 2026-08-30 16:22:21

SQLi 1

Time of First Successful Submission: 2026-08-30 16:23:21

SQLi 2

Time of First Successful Submission: 2026-08-30 16:24:00

SQLi 3

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SQLi 4

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SQLi 5

Time of First Successful Submission: 2026-08-30 16:28:15

XSS 1

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XSS 2

Time of First Successful Submission: 2026-08-30 16:30:24

XSS 3

Time of First Successful Submission: 2026-08-30 16:31:28

XSS 4

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XSS 5

Time of First Successful Submission: 2026-08-30 16:34:11

XSS 6

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XSS 7

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CSRF 1

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CSRF 2

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CSRF 3

Time of First Successful Submission: 2026-08-30 16:47:13

CSRF 4

Time of First Successful Submission: 2026-08-30 16:49:25

CSRF 5

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Connect

Time of First Successful Submission: 2026-08-30 17:00:35

Send

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Shutdown

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Listen

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Scan 1

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Scan 2

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Monitor 1

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Monitor 2

Time of First Successful Submission: 2026-08-30 17:23:29

Sniffing Cookies

Time of First Successful Submission: 2026-08-30 17:25:09

Network Configuration

Time of First Successful Submission: 2026-08-30 17:27:58

Firewall 1

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Firewall 2

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Firewall 3

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Denial of Service 1

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Denial of Service 2

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Denial of Service 3

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Ethernet

Time of First Successful Submission: 2026-08-30 18:28:49

IP

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TCP

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TCP Handshake

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UDP

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UDP 2

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UDP Spoofing 1

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UDP Spoofing 2

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UDP Spoofing 3

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UDP Spoofing 4

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ARP

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Intercept

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Man-in-the-Middle

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XOR

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XORing Hex

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XORing ASCII

Time of First Successful Submission: 2026-08-30 19:59:05

XORing ASCII Strings

Time of First Successful Submission: 2026-08-30 20:02:07

One-time Pad

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One-time Pad Tampering

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Many-time Pad

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AES

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AES-ECB-CPA

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AES-ECB-CPA-HTTP

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AES-ECB-CPA-HTTP (base64)

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AES-ECB-CPA-Suffix

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AES-ECB-CPA-Prefix

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AES-ECB-CPA-Prefix-2

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AES-ECB-CPA-Prefix-Miniboss

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AES-ECB-CPA-Prefix-Boss

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AES-CBC

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AES-CBC Tampering

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AES-CBC Resizing

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AES-CBC-POA-Partial-Block

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AES-CBC-POA-Full-Block

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AES-CBC-POA-Multi-Block

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AES-CBC-POA-Encrypt

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AES-CBC-POA-Encrypt-2

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DHKE

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DHKE-to-AES

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RSA 3

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RSA 4

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RSA Signatures

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SHA 1

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SHA 2

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TLS 1

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TLS 2

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level1

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level2

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level3

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level4

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level5

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level6

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level7

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level8

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level9

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level10

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level11

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level12

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level13

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level14

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level15

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level16

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level17

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level18

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level19

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File Formats: Magic Numbers (Python)

Time of First Successful Submission: 2026-08-31 11:07:29

File Formats: Magic Numbers (C)

Time of First Successful Submission: 2026-08-31 11:08:26

File Formats: Magic Numbers (x86)

Time of First Successful Submission: 2026-08-31 11:09:32

Reading Endianness (Python)

Time of First Successful Submission: 2026-08-31 11:10:18

Reading Endianness (C)

Time of First Successful Submission: 2026-08-31 11:10:58

Reading Endianness (x86)

Time of First Successful Submission: 2026-08-31 11:11:37

Version Information (Python)

Time of First Successful Submission: 2026-08-31 11:12:21

Version Information (C)

Time of First Successful Submission: 2026-08-31 11:13:03

Version Information (x86)

Time of First Successful Submission: 2026-08-31 11:13:43

Metadata and Data (Python)

Time of First Successful Submission: 2026-08-31 11:14:28

Metadata and Data (C)

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Metadata and Data (x86)

Time of First Successful Submission: 2026-08-31 11:16:11

Input Restrictions (Python)

Time of First Successful Submission: 2026-08-31 11:16:58

Input Restrictions (C)

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Input Restrictions (x86)

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Behold the cIMG! (Python)

Time of First Successful Submission: 2026-08-31 11:19:28

Behold the cIMG! (C)

Time of First Successful Submission: 2026-08-31 11:20:21

Behold the cIMG! (x86)

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A Basic cIMG (Python)

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A Basic cIMG (C)

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A Basic cIMG (x86)

Time of First Successful Submission: 2026-08-31 11:23:41

Internal State Mini (C)

Time of First Successful Submission: 2026-08-31 11:24:42

Internal State Mini (x86)

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Internal State (C)

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Internal State (x86)

Time of First Successful Submission: 2026-08-31 11:28:48

File Formats: Directives (C)

Time of First Successful Submission: 2026-08-31 11:30:06

File Formats: Directives (x86)

Time of First Successful Submission: 2026-08-31 11:31:24

Start Here

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Using the Terminal

Time of First Successful Submission: 2026-08-27 12:20:10

Using the VSCode Workspace

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Using the GUI Desktop

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Pasting into the Desktop

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Restarting Challenges

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Challenge Programs

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The Flag File

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Using Privileged Mode

Time of First Successful Submission: 2026-08-27 13:07:43

Persistent Home Directories - One

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Persistent Home Directories - Two

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Linux Luminarium

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Intro to Commands

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Intro to Arguments

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Command History

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The Root

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Program and absolute paths

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Position thy self

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Position elsewhere

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implicit relative paths, from /

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explicit relative paths, from /

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implicit relative path

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home sweet home

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cat: not the pet, but the command!

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catting absolute paths

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more catting practice

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grepping for a needle in a haystack

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comparing files

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listing files

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touching files

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removing files

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moving files

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copying files

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hidden files

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An Epic Filesystem Quest

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making directories

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finding files

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linking files

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Learning From Documentation

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Learning Complex Usage

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Reading Manuals

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Searching Manuals

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Searching For Manuals

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Helpful Programs

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Help for Builtins

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Matching with *

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Matching with ?

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Matching with []

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Matching paths with []

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Multiple globs

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Mixing globs

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Exclusionary globbing

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Tab completion

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Multiple options for tab completion

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Tab completion on commands

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Redirecting output

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Redirecting more output

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Appending output

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Redirecting errors

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Redirecting input

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Grepping stored results

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Grepping live output

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Grepping errors

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Filtering with grep -v

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Filtering with sed

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Duplicating piped data with tee

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Process substitution for input

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Writing to multiple programs

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Split-piping stderr and stdout

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Named pipes

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Printing Variables

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Setting Variables

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Multi-word Variables

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Exporting Variables

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Printing Exported Variables

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Storing Command Output

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Reading Input

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Reading Files

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Translating characters

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Deleting characters

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Deleting newlines

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Extracting the first lines with head

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Extracting specific sections of text

Time of First Successful Submission: 2026-08-27 17:05:29

Sorting data

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Listing Processes

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Killing Processes

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Interrupting Processes

Time of First Successful Submission: 2026-08-27 17:14:54

Killing Misbehaving Processes

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Suspending Processes

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Resuming Processes

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Backgrounding Processes

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Foregrounding Processes

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Starting Backgrounded Processes

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Process Exit Codes

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Becoming root with su

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Other users with su

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Cracking passwords

Time of First Successful Submission: 2026-08-27 17:39:12

Using sudo

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Changing File Ownership

Time of First Successful Submission: 2026-08-27 17:50:01

Groups and Files

Time of First Successful Submission: 2026-08-27 17:50:31

Fun With Groups Names

Time of First Successful Submission: 2026-08-27 17:51:06

Changing Permissions

Time of First Successful Submission: 2026-08-27 17:51:33

Executable Files

Time of First Successful Submission: 2026-08-27 17:52:02

Permission Tweaking Practice

Time of First Successful Submission: 2026-08-27 17:54:42

Permissions Setting Practice

Time of First Successful Submission: 2026-08-27 17:55:24

The SUID Bit

Time of First Successful Submission: 2026-08-27 18:00:04

Chaining with Semicolons

Time of First Successful Submission: 2026-08-27 18:33:12

Building on Success

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Handling Failure

Time of First Successful Submission: 2026-08-27 18:34:23

Your First Shell Script

Time of First Successful Submission: 2026-08-27 18:35:00

Redirecting Script Output

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Executable Shell Scripts

Time of First Successful Submission: 2026-08-27 18:36:10

Understanding Shebangs

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Scripting with Arguments

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Scripting with Conditionals

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Scripting with Default Cases

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Scripting with Multiple Conditions

Time of First Successful Submission: 2026-08-27 18:39:31

Reading Shell Scripts

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Launching Screen

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Detaching and Attaching

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Finding Sessions

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Switching Windows

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Detaching and Attaching (tmux)

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Switching Windows (tmux)

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The PATH Variable

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Setting PATH

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Finding Commands

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Adding Commands

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Hijacking Commands

Time of First Successful Submission: 2026-08-27 18:58:21

Bashrc Backdoor

Time of First Successful Submission: 2026-08-27 19:01:39

Sniffing Input

Time of First Successful Submission: 2026-08-27 19:04:37

Overshared Directories

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Tricky Linking

Time of First Successful Submission: 2026-08-27 19:08:50

Sniffing Process Arguments

Time of First Successful Submission: 2026-08-27 19:10:09

Snooping on Configurations

Time of First Successful Submission: 2026-08-27 19:12:53

The Fork Bomb

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Disk-Space Doomsday

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rm -rf /

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Life after rm -rf /

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Finding meaning after rm -rf /

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Computing 101

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Your First Register

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Your First Syscall

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Exit Codes

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Building Executables

Time of First Successful Submission: 2026-08-27 19:56:05

Moving Between Registers

Time of First Successful Submission: 2026-08-27 19:56:42

Loading From Memory

Time of First Successful Submission: 2026-08-27 20:05:18

More Loading Practice

Time of First Successful Submission: 2026-08-27 20:05:57

Dereferencing Pointers

Time of First Successful Submission: 2026-08-27 20:06:32

Dereferencing Yourself

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Dereferencing with Offsets

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Stored Addresses

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Double Dereference

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The Stack

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Stack Offsets

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Program Arguments on the Stack

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Popping From the Stack

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Negative Numbers

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Negative Numbers (16-bit)

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Negative Numbers (32-bit)

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Encoding Negatives

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Binary and Hex Encoding

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More Hex

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Decoding Hex

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Mixed Conversions

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Disassembling Programs

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Tracing Syscalls

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Starting GDB

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Quitting GDB

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Starting Programs in GDB

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Disassembling in GDB

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Stepping Through Instructions

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Reading Register Values

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Setting Register Values

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Popping Stack Values

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Examining Memory

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Examining Stack Pointers

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Cooperative Debugging

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Running with Arguments

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Redirecting Input in GDB

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Writing Output

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Chaining Syscalls

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Writing Strings

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Reading Data

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Reading Exactly

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Opening Files

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Hardcoding the Filename

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RIP-Relative Strings

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Comparing Values

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Comparing Characters

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Conditional Control Flow

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Comparing Strings

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Reverse the Password

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Conditionals Without Conditionals

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Recognizing Loops

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Writing Loops

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Writing From a Shared Library

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Returning a Value

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Calling Through a Pointer

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Calling Through a Pointer with an Argument

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Saving Caller-Saved Registers

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Saving Callee-Saved Registers

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Sign Extension

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Little-Endian Bytes

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Qword by Qword

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Dword by Dword

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Word by Word

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Byte by Byte

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Cracking a Struct

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Scrambled Struct

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Reverse the Calculation

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Reverse the Reverse

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Dealing with Bitwise Operations

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Even or Odd

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Masking Bits

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Lowercase a String

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Uppercase a String

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Swap Case

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Shifting Left

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Shifting Right

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Loops on Data

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Reaching Into the Caller's Frame

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Loading Stale Stack Data

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Stealing Stale Stack Data

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Reserving Your Own Frame

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Using Your Own Frame

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Environment Variables on the Stack

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Aligning the Stack Through the Environment

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Aligning the Stack Through GDB

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Aligning the Stack Through GDB, Generalized

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A Single Digit

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Two Digits

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String to Integer

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Negative Numbers

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Where the Number Ends

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A Whole Program

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A Single Digit, Back to Text

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Divide and Remainder

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Drop the Leading Zero

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Integer to String

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Negative Numbers, Back to Text

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Sum Them All

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Addition

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Subtraction

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Multiplication

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Bitwise Operators

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Unary Operators

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Literal Output

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Newline Escapes

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Escaped Syntax

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Decimal Markers

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Multiple Decimal Markers

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String Markers

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Hex Byte Escapes

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Debugging Programs

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Inspecting Registers

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Examining Memory

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Setting Breakpoints

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GDB Scripting

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Modifying Data

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Modifying Execution

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Broken Functions

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Exit

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Socket

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Bind

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Listen

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Accept

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Static Response

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Dynamic Response

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Iterative GET Server

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Concurrent GET Server

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Concurrent POST Server

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Web Server

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Playing With Programs

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What's the password?

Time of First Successful Submission: 2026-08-30 13:37:19

... and again!

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Newline Troubles

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Reasoning about files

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Specifying Filenames

Time of First Successful Submission: 2026-08-30 13:39:29

Binary and Hex Encoding

Time of First Successful Submission: 2026-08-30 13:40:00

More Hex

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Decoding Hex

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Decoding Practice

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Encoding Practice

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Hex-encoding ASCII

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Nested Encoding

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Hex-encoding UTF-8

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UTF Mixups

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Modifying Encoded Data

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Decoding Base64

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Encoding Base64

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Dealing with Obfuscation

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Dealing with Obfuscation 2

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Your First HTTP Request

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Reading Flask

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Commented Data

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HTTP Metadata

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HTTP (netcat)

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HTTP Paths (netcat)

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HTTP (curl)

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HTTP (python)

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HTTP Host Header (python)

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HTTP Host Header (curl)

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HTTP Host Header (netcat)

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URL Encoding (netcat)

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HTTP GET Parameters

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Multiple HTTP Parameters (netcat)

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Multiple HTTP Parameters (curl)

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HTTP Forms

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HTTP Forms (curl)

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HTTP Forms (netcat)

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HTTP Forms (python)

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HTTP Forms Without Forms

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Multiple Form Fields (curl)

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Multiple Form Fields (netcat)

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HTTP Redirects (netcat)

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HTTP Redirects (curl)

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HTTP Redirects (python)

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HTTP Cookies (curl)

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HTTP Cookies (netcat)

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HTTP Cookies (python)

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Server State (python)

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Listening Web

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Speaking Redirects

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JavaScript Redirects

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Including JavaScript

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HTTP (javascript)

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HTTP Get Parameters (javascript)

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HTTP Forms (javascript)

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cat

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more

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less

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tail

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head

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sort

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vim

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emacs

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nano

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rev

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od

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hd

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xxd

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base32

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base64

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split

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gzip

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bzip2

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zip

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tar

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ar

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cpio

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genisoimage

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env

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find

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make

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nice

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timeout

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stdbuf

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setarch

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watch

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socat

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whiptail

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awk

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sed

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ed

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chown

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chmod

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cp

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mv

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perl

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python

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ruby

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bash

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date

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dmesg

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wc

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gcc

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as

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wget

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ssh-keygen

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SQL Queries

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Filtering SQL

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Choosing Columns

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Exclusionary Filtering

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Filtering Strings

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Filtering on Expressions

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SELECTing Expressions

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Composite Conditions

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Reaching Your LIMITs

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Querying Metadata

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DSU Cyber Camps

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Using the Terminal

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Using the VSCode Workspace

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Using the GUI Desktop

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Pasting into the Desktop

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Connecting over SSH

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Restarting Challenges

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Getting Help

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Challenge Programs

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The Flag File

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Using Privileged Mode

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Persistent Home Directories - One

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Persistent Home Directories - Two

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GCA CTF

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Using the Terminal

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Using the VSCode Workspace

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Using the GUI Desktop

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Pasting into the Desktop

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Connecting over SSH

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Restarting Challenges

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Getting Help

Time of First Successful Submission: 2026-08-27 12:35:07

Challenge Programs

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The Flag File

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Using Privileged Mode

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Persistent Home Directories - One

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Persistent Home Directories - Two

Time of First Successful Submission: 2026-08-27 13:12:47