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Intro to Programming Languages

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Commands

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Command Arguments

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Command History

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The Root Path

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Absolute Paths

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Changing position

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Changing to an Absolute Path

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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

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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: 2026-10-19 13:38:06

File Formats: Magic Numbers (C)

Time of First Successful Submission: 2026-10-19 13:41:27

File Formats: Magic Numbers (x86)

Time of First Successful Submission: 2026-10-19 13:50:51

Reading Endianness (Python)

Time of First Successful Submission: 2026-10-19 13:58:23

Reading Endianness (C)

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Reading Endianness (x86)

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Version Information (Python)

Time of First Successful Submission: 2026-10-19 14:24:56

Version Information (C)

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Version Information (x86)

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Metadata and Data (Python)

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Metadata and Data (C)

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Start Here

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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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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: 2026-10-26 10:35:32

Intro to Arguments

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Command History

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The Root

Time of First Successful Submission: 2026-10-26 10:38:23

Program and absolute paths

Time of First Successful Submission: 2026-10-26 10:38:54

Position thy self

Time of First Successful Submission: 2026-10-26 10:39:32

Position elsewhere

Time of First Successful Submission: 2026-10-26 10:40:39

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

Time of First Successful Submission: 2026-10-27 10:22:59

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 /

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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

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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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Negative Numbers

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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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Playing With Programs

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What's the password?

Time of First Successful Submission: 2026-10-19 07:56:19

... and again!

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Newline Troubles

Time of First Successful Submission: 2026-10-19 08:01:12

Reasoning about files

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Specifying Filenames

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Binary and Hex Encoding

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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

Time of First Successful Submission: 2026-10-28 13:53:16

xxd

Time of First Successful Submission: 2026-10-28 13:56:55

base32

Time of First Successful Submission: 2026-10-28 13:57:25

base64

Time of First Successful Submission: 2026-10-28 13:58:04

split

Time of First Successful Submission: 2026-10-28 14:02:33

gzip

Time of First Successful Submission: 2026-10-28 14:08:01

bzip2

Time of First Successful Submission: 2026-10-28 14:06:55

zip

Time of First Successful Submission: 2026-10-28 14:09:06

tar

Time of First Successful Submission: 2026-10-28 14:11:08

ar

Time of First Successful Submission: 2026-10-28 14:14:16

cpio

Time of First Successful Submission: 2026-10-28 14:15:34

genisoimage

Time of First Successful Submission: 2026-10-28 14:17:42

env

Time of First Successful Submission: 2026-10-28 14:24:13

find

Time of First Successful Submission: 2026-10-28 14:25:15

make

Time of First Successful Submission: 2026-10-28 14:26:07

nice

Time of First Successful Submission: 2026-10-28 14:27:04

timeout

Time of First Successful Submission: 2026-10-28 14:27:44

stdbuf

Time of First Successful Submission: 2026-10-28 14:28:32

setarch

Time of First Successful Submission: 2026-10-28 14:30:38

watch

Time of First Successful Submission: 2026-10-28 14:36:20

socat

Time of First Successful Submission: 2026-10-28 14:37:16

whiptail

Time of First Successful Submission: 2026-10-28 14:40:39

awk

Time of First Successful Submission: 2026-10-28 14:42:29

sed

Time of First Successful Submission: 2026-10-28 14:43:06

ed

Time of First Successful Submission: 2026-10-28 14:44:23

chown

Time of First Successful Submission: 2026-10-28 14:45:34

chmod

Time of First Successful Submission: 2026-10-28 14:46:24

cp

Time of First Successful Submission: 2026-10-28 14:47:29

mv

Time of First Successful Submission: 2026-10-29 06:39:14

perl

Time of First Successful Submission: 2026-10-28 15:06:34

python

Time of First Successful Submission: 2026-10-28 15:07:17

ruby

Time of First Successful Submission: 2026-10-28 15:09:54

bash

Time of First Successful Submission: 2026-10-28 15:10:38

date

Time of First Successful Submission: 2026-10-28 15:11:36

dmesg

Time of First Successful Submission: 2026-10-28 15:12:09

wc

Time of First Successful Submission: 2026-10-28 15:12:53

gcc

Time of First Successful Submission: 2026-10-28 15:25:48

as

Time of First Successful Submission: 2026-10-28 15:27:38

wget

Time of First Successful Submission: 2026-10-28 15:39:44

ssh-keygen

Time of First Successful Submission: 2026-10-28 15:42:50

SQL Queries

Time of First Successful Submission: 2026-10-20 12:11:13

Filtering SQL

Time of First Successful Submission: 2026-10-20 12:17:10

Choosing Columns

Time of First Successful Submission: 2026-10-20 12:59:01

Exclusionary Filtering

Time of First Successful Submission: 2026-10-20 13:12:31

Filtering Strings

Time of First Successful Submission: 2026-10-20 13:22:57

Filtering on Expressions

Time of First Successful Submission: 2026-10-20 13:32:51

SELECTing Expressions

Time of First Successful Submission: 2026-10-20 13:40:30

Composite Conditions

Time of First Successful Submission: 2026-10-28 10:42:50

Reaching Your LIMITs

Time of First Successful Submission: 2026-10-28 10:44:22

Querying Metadata

Time of First Successful Submission: 2026-10-28 10:49:10


DSU Cyber Camps

10 / 104 30986 / 74727


Using the Terminal

Time of First Successful Submission: 2026-10-14 09:37:48

Using the VSCode Workspace

Time of First Successful Submission: 2026-10-14 09:40:50

Using the GUI Desktop

Time of First Successful Submission: 2026-10-14 09:42:03

Pasting into the Desktop

Time of First Successful Submission: 2026-10-14 09:43:32

Restarting Challenges

Time of First Successful Submission: 2026-10-14 09:45:14

Challenge Programs

Time of First Successful Submission: 2026-10-19 07:45:44

The Flag File

Time of First Successful Submission: 2026-10-19 07:46:49

Using Privileged Mode

Time of First Successful Submission: 2026-10-19 07:49:30

Persistent Home Directories - One

Time of First Successful Submission: 2026-10-19 07:53:18

Persistent Home Directories - Two

Time of First Successful Submission: 2026-10-19 07:54:06


GCA CTF

10 / 104 30986 / 74727


Using the Terminal

Time of First Successful Submission: 2026-10-14 09:37:48

Using the VSCode Workspace

Time of First Successful Submission: 2026-10-14 09:40:50

Using the GUI Desktop

Time of First Successful Submission: 2026-10-14 09:42:03

Pasting into the Desktop

Time of First Successful Submission: 2026-10-14 09:43:32

Restarting Challenges

Time of First Successful Submission: 2026-10-14 09:45:14

Challenge Programs

Time of First Successful Submission: 2026-10-19 07:45:44

The Flag File

Time of First Successful Submission: 2026-10-19 07:46:49

Using Privileged Mode

Time of First Successful Submission: 2026-10-19 07:49:30

Persistent Home Directories - One

Time of First Successful Submission: 2026-10-19 07:53:18

Persistent Home Directories - Two

Time of First Successful Submission: 2026-10-19 07:54:06