LiaChristara

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Intro to Programming Languages

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Commands

Time of First Successful Submission: 2026-03-16 07:15:40

Command Arguments

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Command History

Time of First Successful Submission: 2026-03-16 07:17:30

The Root Path

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Absolute Paths

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Changing position

Time of First Successful Submission: 2026-03-16 07:19:38

Changing to an Absolute Path

Time of First Successful Submission: 2026-03-16 07:21:11

Relative Paths

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Cat

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Ls

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Ls All

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Find

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Piping Echo

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Piping Stdout

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Piping Stdin

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Intro to Cybersecurity

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Path Traversal 1

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Path Traversal 2

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CMDi 1

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CMDi 2

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CMDi 3

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CMDi 4

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CMDi 5

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CMDi 6

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Authentication Bypass 1

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Authentication Bypass 2

Time of First Successful Submission: 2026-03-24 20:22:07

SQLi 1

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SQLi 2

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SQLi 3

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SQLi 4

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SQLi 5

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XSS 1

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XSS 2

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XSS 3

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XSS 4

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XSS 5

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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

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CSRF 4

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CSRF 5

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Connect

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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

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Sniffing Cookies

Time of First Successful Submission: 2026-03-29 09:23:59

Network Configuration

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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

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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: 2026-03-31 11:27:39

XORing ASCII Strings

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One-time Pad

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One-time Pad Tampering

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Many-time Pad

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Start Here

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Using the Terminal

Time of First Successful Submission: 2026-03-15 19:52:19

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

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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

Time of First Successful Submission: 2026-03-16 07:15:40

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

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Sorting data

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Listing Processes

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Killing Processes

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Interrupting Processes

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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

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Using sudo

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Changing File Ownership

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Groups and Files

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Fun With Groups Names

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Changing Permissions

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Executable Files

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Permission Tweaking Practice

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Permissions Setting Practice

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The SUID Bit

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Chaining with Semicolons

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Building on Success

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Handling Failure

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Your First Shell Script

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Redirecting Script Output

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Executable Shell Scripts

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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

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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

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Bashrc Backdoor

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Sniffing Input

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Overshared Directories

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Tricky Linking

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Sniffing Process Arguments

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Snooping on Configurations

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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 /

Time of First Successful Submission: 2026-03-16 15:09:05

Computing 101

94 / 94 295 / 21987

Your First Register

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Your First Syscall

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Exit Codes

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Building Executables

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Moving Between Registers

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Loading From Memory

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More Loading Practice

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Dereferencing Pointers

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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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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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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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Writing Output

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Chaining Syscalls

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Writing Strings

Time of First Successful Submission: 2026-03-17 09:56:46

Reading Data

Time of First Successful Submission: 2026-03-17 10:03:02

Opening Files

Time of First Successful Submission: 2026-03-17 10:06:01

Hardcoding the Filename

Time of First Successful Submission: 2026-03-17 10:15:56

Comparing Values

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Comparing Characters

Time of First Successful Submission: 2026-03-17 10:42:30

Conditional Control Flow

Time of First Successful Submission: 2026-03-17 10:46:40

Comparing Strings

Time of First Successful Submission: 2026-03-17 10:48:28

Reverse the Password

Time of First Successful Submission: 2026-03-17 10:53:33

Conditionals Without Conditionals

Time of First Successful Submission: 2026-03-17 12:16:24

Looping

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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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Loops on Data

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set-register

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set-multiple-registers

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add-to-register

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linear-equation-registers

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integer-division

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modulo-operation

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set-upper-byte

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efficient-modulo

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byte-extraction

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bitwise-and

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check-even

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memory-read

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memory-write

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memory-increment

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byte-access

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memory-size-access

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little-endian-write

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memory-sum

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stack-subtraction

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swap-stack-values

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average-stack-values

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absolute-jump

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relative-jump

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jump-trampoline

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conditional-jump

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indirect-jump

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average-loop

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count-non-zero

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string-lower

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most-common-byte

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Exit

Time of First Successful Submission: 2026-03-18 11:01:51

Socket

Time of First Successful Submission: 2026-03-18 11:24:47

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

Time of First Successful Submission: 2026-03-21 20:39:46

Web Server

Time of First Successful Submission: 2026-03-21 20:40:26

Debugging Programs

Time of First Successful Submission: 2026-03-21 20:46:01

Inspecting Registers

Time of First Successful Submission: 2026-03-21 20:49:05

Examining Memory

Time of First Successful Submission: 2026-03-21 21:34:33

Setting Breakpoints

Time of First Successful Submission: 2026-03-22 09:06:21

GDB Scripting

Time of First Successful Submission: 2026-03-22 09:20:14

Modifying Data

Time of First Successful Submission: 2026-03-22 09:45:32

Modifying Execution

Time of First Successful Submission: 2026-03-22 09:49:07

Broken Functions

Time of First Successful Submission: 2026-03-22 10:05:31

Playing With Programs

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What's the password?

Time of First Successful Submission: 2026-03-22 10:19:53

... and again!

Time of First Successful Submission: 2026-03-22 10:20:30

Newline Troubles

Time of First Successful Submission: 2026-03-22 10:28:08

Reasoning about files

Time of First Successful Submission: 2026-03-22 10:29:20

Specifying Filenames

Time of First Successful Submission: 2026-03-22 10:30:31

Binary and Hex Encoding

Time of First Successful Submission: 2026-03-22 11:03:20

More Hex

Time of First Successful Submission: 2026-03-22 11:05:10

Decoding Hex

Time of First Successful Submission: 2026-03-22 11:07:21

Decoding Practice

Time of First Successful Submission: 2026-03-22 11:16:55

Encoding Practice

Time of First Successful Submission: 2026-03-22 11:29:32

Hex-encoding ASCII

Time of First Successful Submission: 2026-03-22 11:46:47

Nested Encoding

Time of First Successful Submission: 2026-03-22 12:05:00

Hex-encoding UTF-8

Time of First Successful Submission: 2026-03-22 12:22:55

UTF Mixups

Time of First Successful Submission: 2026-03-22 12:30:03

Modifying Encoded Data

Time of First Successful Submission: 2026-03-22 12:48:41

Decoding Base64

Time of First Successful Submission: 2026-03-22 12:58:42

Encoding Base64

Time of First Successful Submission: 2026-03-22 13:00:56

Dealing with Obfuscation

Time of First Successful Submission: 2026-03-22 15:45:45

Dealing with Obfuscation 2

Time of First Successful Submission: 2026-03-22 15:56:17

Your First HTTP Request

Time of First Successful Submission: 2026-03-22 19:11:18

Reading Flask

Time of First Successful Submission: 2026-03-22 19:14:11

Commented Data

Time of First Successful Submission: 2026-03-22 19:19:43

HTTP Metadata

Time of First Successful Submission: 2026-03-22 19:24:50

HTTP (netcat)

Time of First Successful Submission: 2026-03-22 19:32:30

HTTP Paths (netcat)

Time of First Successful Submission: 2026-03-22 19:35:45

HTTP (curl)

Time of First Successful Submission: 2026-03-22 19:46:07

HTTP (python)

Time of First Successful Submission: 2026-03-22 19:49:22

HTTP Host Header (python)

Time of First Successful Submission: 2026-03-22 20:07:35

HTTP Host Header (curl)

Time of First Successful Submission: 2026-03-22 20:11:46

HTTP Host Header (netcat)

Time of First Successful Submission: 2026-03-22 20:19:30

URL Encoding (netcat)

Time of First Successful Submission: 2026-03-22 20:22:04

HTTP GET Parameters

Time of First Successful Submission: 2026-03-22 20:30:10

Multiple HTTP Parameters (netcat)

Time of First Successful Submission: 2026-03-22 20:34:14

Multiple HTTP Parameters (curl)

Time of First Successful Submission: 2026-03-22 20:37:03

HTTP Forms

Time of First Successful Submission: 2026-03-22 20:41:46

HTTP Forms (curl)

Time of First Successful Submission: 2026-03-22 20:45:58

HTTP Forms (netcat)

Time of First Successful Submission: 2026-03-22 20:55:29

HTTP Forms (python)

Time of First Successful Submission: 2026-03-22 20:58:02

HTTP Forms Without Forms

Time of First Successful Submission: 2026-03-22 22:03:24

Multiple Form Fields (curl)

Time of First Successful Submission: 2026-03-23 08:28:15

Multiple Form Fields (netcat)

Time of First Successful Submission: 2026-03-23 08:57:25

HTTP Redirects (netcat)

Time of First Successful Submission: 2026-03-23 09:07:27

HTTP Redirects (curl)

Time of First Successful Submission: 2026-03-23 09:08:57

HTTP Redirects (python)

Time of First Successful Submission: 2026-03-23 09:10:10

HTTP Cookies (curl)

Time of First Successful Submission: 2026-03-23 09:14:44

HTTP Cookies (netcat)

Time of First Successful Submission: 2026-03-23 09:16:24

HTTP Cookies (python)

Time of First Successful Submission: 2026-03-23 09:19:46

Server State (python)

Time of First Successful Submission: 2026-03-23 09:24:14

Listening Web

Time of First Successful Submission: 2026-03-23 09:27:58

Speaking Redirects

Time of First Successful Submission: 2026-03-23 09:41:14

JavaScript Redirects

Time of First Successful Submission: 2026-03-23 13:05:52

Including JavaScript

Time of First Successful Submission: 2026-03-23 14:16:56

HTTP (javascript)

Time of First Successful Submission: 2026-03-23 14:24:56

HTTP Get Parameters (javascript)

Time of First Successful Submission: 2026-03-23 14:30:24

HTTP Forms (javascript)

Time of First Successful Submission: 2026-03-23 15:13:32

cat

Time of First Successful Submission: 2026-03-23 16:01:52

more

Time of First Successful Submission: 2026-03-23 16:02:12

less

Time of First Successful Submission: 2026-03-23 16:02:45

tail

Time of First Successful Submission: 2026-03-23 16:03:11

head

Time of First Successful Submission: 2026-03-23 16:03:47

sort

Time of First Successful Submission: 2026-03-23 16:04:02

vim

Time of First Successful Submission: 2026-03-23 16:04:29

emacs

Time of First Successful Submission: 2026-03-23 16:05:10

nano

Time of First Successful Submission: 2026-03-23 16:06:49

rev

Time of First Successful Submission: 2026-03-23 16:07:35

od

Time of First Successful Submission: 2026-03-23 16:15:51

hd

Time of First Successful Submission: 2026-03-23 16:21:09

xxd

Time of First Successful Submission: 2026-03-23 16:21:56

base32

Time of First Successful Submission: 2026-03-23 16:22:41

base64

Time of First Successful Submission: 2026-03-23 16:22:58

split

Time of First Successful Submission: 2026-03-23 16:23:51

gzip

Time of First Successful Submission: 2026-03-23 16:25:12

bzip2

Time of First Successful Submission: 2026-03-23 16:25:50

zip

Time of First Successful Submission: 2026-03-23 16:39:17

tar

Time of First Successful Submission: 2026-03-23 18:40:50

ar

Time of First Successful Submission: 2026-03-23 18:47:54

cpio

Time of First Successful Submission: 2026-03-23 19:11:54

genisoimage

Time of First Successful Submission: 2026-03-23 20:31:21

env

Time of First Successful Submission: 2026-03-23 20:35:28

find

Time of First Successful Submission: 2026-03-23 20:40:07

make

Time of First Successful Submission: 2026-03-23 20:45:17

nice

Time of First Successful Submission: 2026-03-23 20:46:09

timeout

Time of First Successful Submission: 2026-03-23 20:46:47

stdbuf

Time of First Successful Submission: 2026-03-23 20:48:34

setarch

Time of First Successful Submission: 2026-03-23 20:52:48

watch

Time of First Successful Submission: 2026-03-23 20:53:39

socat

Time of First Successful Submission: 2026-03-23 20:57:31

whiptail

Time of First Successful Submission: 2026-03-23 21:03:15

awk

Time of First Successful Submission: 2026-03-23 21:10:17

sed

Time of First Successful Submission: 2026-03-23 21:16:52

ed

Time of First Successful Submission: 2026-03-23 21:18:14

chown

Time of First Successful Submission: 2026-03-24 09:38:52

chmod

Time of First Successful Submission: 2026-03-24 09:39:13

cp

Time of First Successful Submission: 2026-03-24 09:56:18

mv

Time of First Successful Submission: 2026-03-24 10:51:00

perl

Time of First Successful Submission: 2026-03-24 11:04:57

python

Time of First Successful Submission: 2026-03-24 11:06:28

ruby

Time of First Successful Submission: 2026-03-24 11:07:35

bash

Time of First Successful Submission: 2026-03-24 11:14:07

date

Time of First Successful Submission: 2026-03-24 11:15:16

dmesg

Time of First Successful Submission: 2026-03-24 11:17:04

wc

Time of First Successful Submission: 2026-03-24 11:19:49

gcc

Time of First Successful Submission: 2026-03-24 11:31:11

as

Time of First Successful Submission: 2026-03-24 11:31:52

wget

Time of First Successful Submission: 2026-03-24 11:49:44

ssh-keygen

Time of First Successful Submission: 2026-03-24 13:48:05

SQL Queries

Time of First Successful Submission: 2026-03-24 14:55:09

Filtering SQL

Time of First Successful Submission: 2026-03-24 14:58:12

Choosing Columns

Time of First Successful Submission: 2026-03-24 15:00:58

Exclusionary Filtering

Time of First Successful Submission: 2026-03-24 15:02:03

Filtering Strings

Time of First Successful Submission: 2026-03-24 15:02:50

Filtering on Expressions

Time of First Successful Submission: 2026-03-24 15:05:30

SELECTing Expressions

Time of First Successful Submission: 2026-03-24 15:18:38

Composite Conditions

Time of First Successful Submission: 2026-03-24 15:24:19

Reaching Your LIMITs

Time of First Successful Submission: 2026-03-24 15:26:45

Querying Metadata

Time of First Successful Submission: 2026-03-24 15:29:00

GCA CTF

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Using the Terminal

Time of First Successful Submission: 2026-03-15 19:52:19

Using the VSCode Workspace

Time of First Successful Submission: 2026-03-15 19:57:08

Using the GUI Desktop

Time of First Successful Submission: 2026-03-15 19:59:11

Pasting into the Desktop

Time of First Successful Submission: 2026-03-15 20:00:27

Connecting over SSH

Time of First Successful Submission: 2026-03-15 20:07:44

Restarting Challenges

Time of First Successful Submission: 2026-03-15 20:14:52

Challenge Programs

Time of First Successful Submission: 2026-03-15 20:16:49

The Flag File

Time of First Successful Submission: 2026-03-15 20:24:05

Using Privileged Mode

Time of First Successful Submission: 2026-03-15 20:26:25

Persistent Home Directories - One

Time of First Successful Submission: 2026-03-15 20:28:50

Persistent Home Directories - Two

Time of First Successful Submission: 2026-03-15 20:29:34