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Intro to Programming Languages

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Lecture 1.1. Course Environment

Time of First Successful Submission: 2026-03-06 04:03:14

Lab 1.1 - Start Terminal

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Lecture 1.2. Linux Shells

Time of First Successful Submission: 2026-03-07 03:06:54

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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P1.0 Level 5 read

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Cat

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Ls

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Ls All

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P1.0 Level 2 list dir

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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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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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File Formats: Magic Numbers (Python)

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File Formats: Magic Numbers (C)

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File Formats: Magic Numbers (x86)

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Reading Endianness (Python)

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Reading Endianness (C)

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Reading Endianness (x86)

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Version Information (Python)

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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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Metadata and Data (x86)

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Input Restrictions (Python)

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Input Restrictions (C)

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Input Restrictions (x86)

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Behold the cIMG! (Python)

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Behold the cIMG! (C)

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Behold the cIMG! (x86)

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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

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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

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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 /

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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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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

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Reading Data

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Opening Files

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Hardcoding the Filename

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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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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

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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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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

Time of First Successful Submission: 2026-03-20 04:02:33


Playing With Programs

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What's the password?

Time of First Successful Submission: 2026-02-23 02:41:50

... and again!

Time of First Successful Submission: 2026-02-23 02:50:07

Newline Troubles

Time of First Successful Submission: 2026-02-23 21:41:01

Reasoning about files

Time of First Successful Submission: 2026-02-23 21:44:35

Specifying Filenames

Time of First Successful Submission: 2026-02-24 01:17:53

Binary and Hex Encoding

Time of First Successful Submission: 2026-02-24 02:56:15

More Hex

Time of First Successful Submission: 2026-02-24 02:58:38

Decoding Hex

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

Decoding Practice

Time of First Successful Submission: 2026-02-24 03:45:10

Encoding Practice

Time of First Successful Submission: 2026-02-24 04:02:08

Hex-encoding ASCII

Time of First Successful Submission: 2026-02-25 03:16:29

Nested Encoding

Time of First Successful Submission: 2026-02-25 03:26:29

Hex-encoding UTF-8

Time of First Successful Submission: 2026-02-26 02:29:17

UTF Mixups

Time of First Successful Submission: 2026-02-26 02:47:27

Modifying Encoded Data

Time of First Successful Submission: 2026-02-26 03:07:05

Decoding Base64

Time of First Successful Submission: 2026-02-26 03:12:53

Encoding Base64

Time of First Successful Submission: 2026-02-26 03:18:14

Dealing with Obfuscation

Time of First Successful Submission: 2026-02-26 03:24:19

Dealing with Obfuscation 2

Time of First Successful Submission: 2026-02-26 03:32:20

Your First HTTP Request

Time of First Successful Submission: 2026-02-27 05:12:52

Reading Flask

Time of First Successful Submission: 2026-02-28 03:39:36

Commented Data

Time of First Successful Submission: 2026-02-28 03:48:52

HTTP Metadata

Time of First Successful Submission: 2026-02-28 03:51:22

HTTP (netcat)

Time of First Successful Submission: 2026-02-28 04:02:34

HTTP Paths (netcat)

Time of First Successful Submission: 2026-02-28 04:20:41

HTTP (curl)

Time of First Successful Submission: 2026-02-28 04:24:48

HTTP (python)

Time of First Successful Submission: 2026-02-28 04:37:15

HTTP Host Header (python)

Time of First Successful Submission: 2026-02-28 05:11:09

HTTP Host Header (curl)

Time of First Successful Submission: 2026-02-28 05:15:54

HTTP Host Header (netcat)

Time of First Successful Submission: 2026-02-28 05:46:04

URL Encoding (netcat)

Time of First Successful Submission: 2026-03-01 05:08:14

HTTP GET Parameters

Time of First Successful Submission: 2026-03-01 05:11:10

Multiple HTTP Parameters (netcat)

Time of First Successful Submission: 2026-03-01 05:13:12

Multiple HTTP Parameters (curl)

Time of First Successful Submission: 2026-03-01 05:16:53

HTTP Forms

Time of First Successful Submission: 2026-03-01 05:19:40

HTTP Forms (curl)

Time of First Successful Submission: 2026-03-01 05:23:53

HTTP Forms (netcat)

Time of First Successful Submission: 2026-03-01 05:36:04

HTTP Forms (python)

Time of First Successful Submission: 2026-03-01 18:07:10

HTTP Forms Without Forms

Time of First Successful Submission: 2026-03-01 05:56:16

Multiple Form Fields (curl)

Time of First Successful Submission: 2026-03-01 05:59:32

Multiple Form Fields (netcat)

Time of First Successful Submission: 2026-03-01 14:52:15

HTTP Redirects (netcat)

Time of First Successful Submission: 2026-03-02 01:43:00

HTTP Redirects (curl)

Time of First Successful Submission: 2026-03-02 01:44:49

HTTP Redirects (python)

Time of First Successful Submission: 2026-03-02 01:48:11

HTTP Cookies (curl)

Time of First Successful Submission: 2026-03-02 02:24:52

HTTP Cookies (netcat)

Time of First Successful Submission: 2026-03-02 02:30:13

HTTP Cookies (python)

Time of First Successful Submission: 2026-03-02 02:36:32

Server State (python)

Time of First Successful Submission: 2026-03-02 02:43:08

Listening Web

Time of First Successful Submission: 2026-03-02 02:49:55

Speaking Redirects

Time of First Successful Submission: 2026-03-02 03:28:56

JavaScript Redirects

Time of First Successful Submission: 2026-03-02 03:51:32

Including JavaScript

Time of First Successful Submission: 2026-03-02 04:39:56

HTTP (javascript)

Time of First Successful Submission: 2026-03-03 03:44:45

HTTP Get Parameters (javascript)

Time of First Successful Submission: 2026-03-03 03:52:27

HTTP Forms (javascript)

Time of First Successful Submission: 2026-03-03 04:00:26

cat

Time of First Successful Submission: 2026-03-04 15:56:04

more

Time of First Successful Submission: 2026-03-04 20:26:12

less

Time of First Successful Submission: 2026-03-04 20:26:30

tail

Time of First Successful Submission: 2026-03-04 20:26:39

head

Time of First Successful Submission: 2026-03-04 20:27:03

sort

Time of First Successful Submission: 2026-03-04 20:27:16

vim

Time of First Successful Submission: 2026-03-04 20:27:24

emacs

Time of First Successful Submission: 2026-03-04 20:27:32

nano

Time of First Successful Submission: 2026-03-04 20:27:42

rev

Time of First Successful Submission: 2026-03-04 20:27:54

od

Time of First Successful Submission: 2026-03-04 20:28:05

hd

Time of First Successful Submission: 2026-03-04 20:28:17

xxd

Time of First Successful Submission: 2026-03-04 20:28:28

base32

Time of First Successful Submission: 2026-03-04 20:28:37

base64

Time of First Successful Submission: 2026-03-04 20:28:46

split

Time of First Successful Submission: 2026-03-04 20:28:55

gzip

Time of First Successful Submission: 2026-03-04 20:29:04

bzip2

Time of First Successful Submission: 2026-03-04 20:29:14

zip

Time of First Successful Submission: 2026-03-04 20:29:21

tar

Time of First Successful Submission: 2026-03-04 20:29:30

ar

Time of First Successful Submission: 2026-03-04 20:29:40

cpio

Time of First Successful Submission: 2026-03-04 20:29:54

genisoimage

Time of First Successful Submission: 2026-03-04 20:30:08

env

Time of First Successful Submission: 2026-03-04 20:30:17

find

Time of First Successful Submission: 2026-03-04 20:30:25

make

Time of First Successful Submission: 2026-03-04 20:30:33

nice

Time of First Successful Submission: 2026-03-04 20:30:42

timeout

Time of First Successful Submission: 2026-03-04 20:30:52

stdbuf

Time of First Successful Submission: 2026-03-04 20:31:49

setarch

Time of First Successful Submission: 2026-03-04 20:32:50

watch

Time of First Successful Submission: 2026-03-04 20:33:25

socat

Time of First Successful Submission: 2026-03-04 20:35:19

whiptail

Time of First Successful Submission: 2026-03-04 20:36:43

awk

Time of First Successful Submission: 2026-03-04 20:37:38

sed

Time of First Successful Submission: 2026-03-04 20:38:23

ed

Time of First Successful Submission: 2026-03-04 20:39:14

chown

Time of First Successful Submission: 2026-03-04 20:40:09

chmod

Time of First Successful Submission: 2026-03-04 20:40:56

cp

Time of First Successful Submission: 2026-03-04 20:43:41

mv

Time of First Successful Submission: 2026-03-06 03:11:44

perl

Time of First Successful Submission: 2026-03-04 21:05:52

python

Time of First Successful Submission: 2026-03-04 21:21:37

ruby

Time of First Successful Submission: 2026-03-04 21:26:18

bash

Time of First Successful Submission: 2026-03-04 21:27:29

date

Time of First Successful Submission: 2026-03-04 21:28:17

dmesg

Time of First Successful Submission: 2026-03-04 21:29:15

wc

Time of First Successful Submission: 2026-03-04 21:30:01

gcc

Time of First Successful Submission: 2026-03-04 21:30:40

as

Time of First Successful Submission: 2026-03-04 21:31:19

wget

Time of First Successful Submission: 2026-03-04 21:33:40

ssh-keygen

Time of First Successful Submission: 2026-03-04 21:41:45

SQL Queries

Time of First Successful Submission: 2026-03-03 04:13:13

Filtering SQL

Time of First Successful Submission: 2026-03-03 04:25:28

Choosing Columns

Time of First Successful Submission: 2026-03-03 04:29:47

Exclusionary Filtering

Time of First Successful Submission: 2026-03-03 04:33:58

Filtering Strings

Time of First Successful Submission: 2026-03-03 15:26:49

Filtering on Expressions

Time of First Successful Submission: 2026-03-03 15:30:41

SELECTing Expressions

Time of First Successful Submission: 2026-03-03 15:48:31

Composite Conditions

Time of First Successful Submission: 2026-03-03 15:55:08

Reaching Your LIMITs

Time of First Successful Submission: 2026-03-03 15:58:59

Querying Metadata

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


Content Injection

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Teacher Login

Time of First Successful Submission: 2026-02-17 14:49:28

Teacher Login 2

Time of First Successful Submission: 2026-02-17 16:51:41

Teacher Login 3

Time of First Successful Submission: 2026-02-17 15:57:27

Teacher Login 4

Time of First Successful Submission: 2026-02-17 16:06:06

Teacher Login 5

Time of First Successful Submission: 2026-02-17 16:15:12

Teacher Login 6

Time of First Successful Submission: 2026-02-17 16:22:29

Teacher Login 7

Time of First Successful Submission: 2026-02-17 16:51:06

Class Cancellation

Time of First Successful Submission: 2026-02-17 17:10:25

Class Cancellation 2

Time of First Successful Submission: 2026-02-17 17:15:19

Class Cancellation 3

Time of First Successful Submission: 2026-02-17 17:31:40


DOS Dojo

7 / 10 49 / 71


cat.exe (type)

Time of First Successful Submission: 2026-03-09 20:49:36

ls.exe (dir)

Time of First Successful Submission: 2026-03-09 22:25:30

Changing Disks

Time of First Successful Submission: 2026-03-09 22:26:32

Reading Floppies

Time of First Successful Submission: 2026-03-10 01:31:02

Installing MS-DOS

Time of First Successful Submission: 2026-03-10 01:48:12

autoexec.bat

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

doskey

Time of First Successful Submission: 2026-03-10 02:10:27


GCA CTF

12 / 104 1088 / 43623


Using the Terminal

Time of First Successful Submission: 2026-01-18 04:47:21

Using the VSCode Workspace

Time of First Successful Submission: 2026-01-18 04:51:01

Using the GUI Desktop

Time of First Successful Submission: 2026-01-18 04:58:18

Pasting into the Desktop

Time of First Successful Submission: 2026-01-18 05:01:19

Connecting over SSH

Time of First Successful Submission: 2026-01-18 05:04:26

Restarting Challenges

Time of First Successful Submission: 2026-01-18 05:08:08

Getting Help

Time of First Successful Submission: 2026-01-18 05:14:23

Challenge Programs

Time of First Successful Submission: 2026-01-18 15:03:17

The Flag File

Time of First Successful Submission: 2026-01-18 15:05:44

Using Privileged Mode

Time of First Successful Submission: 2026-01-19 02:12:00

Persistent Home Directories - One

Time of First Successful Submission: 2026-01-19 02:14:41

Persistent Home Directories - Two

Time of First Successful Submission: 2026-01-19 02:15:54


Hanto Dojo

10 / 44 42 / 314


Evaluating Is Fun!

Time of First Successful Submission: 2026-02-18 20:05:03

Variables Are Fun!

Time of First Successful Submission: 2026-02-18 20:23:22

Functions Are Fun!

Time of First Successful Submission: 2026-02-18 20:30:55

Printing Is Fun!

Time of First Successful Submission: 2026-02-18 20:59:28

Opening Is Fun!

Time of First Successful Submission: 2026-02-18 21:11:05

Globals Are Fun!

Time of First Successful Submission: 2026-02-18 23:11:04

Modules Are Fun!

Time of First Successful Submission: 2026-02-19 01:10:40

Importing Is Fun!

Time of First Successful Submission: 2026-02-19 01:13:39

Attributes Are Fun!

Time of First Successful Submission: 2026-02-19 01:23:09

Nesting Is Fun!

Time of First Successful Submission: 2026-02-19 01:56:12