Gokongggggggg

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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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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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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

Time of First Successful Submission: 2026-03-01 06:54:15

Inspecting Registers

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

Examining Memory

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Setting Breakpoints

Time of First Successful Submission: 2026-03-01 07:58:28

GDB Scripting

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Modifying Data

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Modifying Execution

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Broken Functions

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Playing With Programs

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What's the password?

Time of First Successful Submission: 2026-03-02 03:37:34

... and again!

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Newline Troubles

Time of First Successful Submission: 2026-03-02 03:45:54

Reasoning about files

Time of First Successful Submission: 2026-03-02 03:53:15

Specifying Filenames

Time of First Successful Submission: 2026-03-02 03:57:31

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

Time of First Successful Submission: 2026-03-03 02:21:17

Your First HTTP Request

Time of First Successful Submission: 2026-03-03 02:38:29

Reading Flask

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Commented Data

Time of First Successful Submission: 2026-03-03 02:56:49

HTTP Metadata

Time of First Successful Submission: 2026-03-03 11:27:44

HTTP (netcat)

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HTTP Paths (netcat)

Time of First Successful Submission: 2026-03-03 11:55:19

HTTP (curl)

Time of First Successful Submission: 2026-03-03 11:58:21

HTTP (python)

Time of First Successful Submission: 2026-03-03 12:14:01

HTTP Host Header (python)

Time of First Successful Submission: 2026-03-03 12:19:03

HTTP Host Header (curl)

Time of First Successful Submission: 2026-03-03 12:24:07

HTTP Host Header (netcat)

Time of First Successful Submission: 2026-03-03 12:40:02

URL Encoding (netcat)

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

HTTP GET Parameters

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

Multiple HTTP Parameters (netcat)

Time of First Successful Submission: 2026-03-03 14:08:40

Multiple HTTP Parameters (curl)

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

HTTP Forms

Time of First Successful Submission: 2026-03-03 14:19:21

HTTP Forms (curl)

Time of First Successful Submission: 2026-03-03 14:27:30

HTTP Forms (netcat)

Time of First Successful Submission: 2026-03-03 14:35:05

HTTP Forms (python)

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

HTTP Forms Without Forms

Time of First Successful Submission: 2026-03-03 14:49:23

Multiple Form Fields (curl)

Time of First Successful Submission: 2026-03-03 14:54:40

Multiple Form Fields (netcat)

Time of First Successful Submission: 2026-03-03 15:01:13

HTTP Redirects (netcat)

Time of First Successful Submission: 2026-03-03 16:26:55

HTTP Redirects (curl)

Time of First Successful Submission: 2026-03-03 16:33:36

HTTP Redirects (python)

Time of First Successful Submission: 2026-03-03 16:35:52

HTTP Cookies (curl)

Time of First Successful Submission: 2026-03-03 16:41:12

HTTP Cookies (netcat)

Time of First Successful Submission: 2026-03-03 16:49:38

HTTP Cookies (python)

Time of First Successful Submission: 2026-03-03 16:54:36

Server State (python)

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

Listening Web

Time of First Successful Submission: 2026-03-03 17:09:04

Speaking Redirects

Time of First Successful Submission: 2026-03-03 17:22:05

JavaScript Redirects

Time of First Successful Submission: 2026-03-03 17:34:55

Including JavaScript

Time of First Successful Submission: 2026-03-04 02:19:25

HTTP (javascript)

Time of First Successful Submission: 2026-03-04 03:11:52

HTTP Get Parameters (javascript)

Time of First Successful Submission: 2026-03-04 03:17:59

HTTP Forms (javascript)

Time of First Successful Submission: 2026-03-04 03:28:36

cat

Time of First Successful Submission: 2026-03-04 03:30:19

more

Time of First Successful Submission: 2026-03-04 03:31:17

less

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

tail

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

head

Time of First Successful Submission: 2026-03-04 03:34:18

sort

Time of First Successful Submission: 2026-03-04 03:35:12

vim

Time of First Successful Submission: 2026-03-04 03:36:00

emacs

Time of First Successful Submission: 2026-03-04 03:37:33

nano

Time of First Successful Submission: 2026-03-04 03:38:58

rev

Time of First Successful Submission: 2026-03-04 03:41:27

od

Time of First Successful Submission: 2026-03-04 05:25:38

hd

Time of First Successful Submission: 2026-03-04 05:33:46

xxd

Time of First Successful Submission: 2026-03-04 05:38:43

base32

Time of First Successful Submission: 2026-03-04 05:45:07

base64

Time of First Successful Submission: 2026-03-04 05:48:43

split

Time of First Successful Submission: 2026-03-04 06:01:33

gzip

Time of First Successful Submission: 2026-03-04 06:19:48

bzip2

Time of First Successful Submission: 2026-03-04 06:21:18

zip

Time of First Successful Submission: 2026-03-04 06:27:20

tar

Time of First Successful Submission: 2026-03-04 06:38:26

ar

Time of First Successful Submission: 2026-03-04 09:55:25

cpio

Time of First Successful Submission: 2026-03-04 10:33:22

genisoimage

Time of First Successful Submission: 2026-03-04 10:51:58

env

Time of First Successful Submission: 2026-03-04 10:56:00

find

Time of First Successful Submission: 2026-03-04 11:04:26

make

Time of First Successful Submission: 2026-03-04 11:10:55

nice

Time of First Successful Submission: 2026-03-04 11:15:30

timeout

Time of First Successful Submission: 2026-03-04 11:17:20

stdbuf

Time of First Successful Submission: 2026-03-04 11:20:10

setarch

Time of First Successful Submission: 2026-03-04 11:25:08

watch

Time of First Successful Submission: 2026-03-04 11:32:10

socat

Time of First Successful Submission: 2026-03-04 11:37:31

whiptail

Time of First Successful Submission: 2026-03-04 12:14:06

awk

Time of First Successful Submission: 2026-03-04 12:31:21

sed

Time of First Successful Submission: 2026-03-04 12:34:26

ed

Time of First Successful Submission: 2026-03-04 12:38:29

chown

Time of First Successful Submission: 2026-03-04 12:37:20

chmod

Time of First Successful Submission: 2026-03-04 12:36:27

cp

Time of First Successful Submission: 2026-03-04 12:43:53

mv

Time of First Successful Submission: 2026-03-08 12:14:08

perl

Time of First Successful Submission: 2026-03-08 12:25:42

python

Time of First Successful Submission: 2026-03-08 12:27:41

ruby

Time of First Successful Submission: 2026-03-08 12:29:41

bash

Time of First Successful Submission: 2026-03-08 12:34:36

date

Time of First Successful Submission: 2026-03-08 12:36:42

dmesg

Time of First Successful Submission: 2026-03-08 12:38:08

wc

Time of First Successful Submission: 2026-03-08 12:41:44

gcc

Time of First Successful Submission: 2026-03-08 12:42:35

as

Time of First Successful Submission: 2026-03-08 12:43:25

wget

Time of First Successful Submission: 2026-03-08 12:52:35

ssh-keygen

Time of First Successful Submission: 2026-03-08 13:00:12

SQL Queries

Time of First Successful Submission: 2026-03-09 04:23:41

Filtering SQL

Time of First Successful Submission: 2026-03-09 04:28:05

Choosing Columns

Time of First Successful Submission: 2026-03-09 04:30:03

Exclusionary Filtering

Time of First Successful Submission: 2026-03-09 04:34:32

Filtering Strings

Time of First Successful Submission: 2026-03-09 04:37:21

Filtering on Expressions

Time of First Successful Submission: 2026-03-09 04:52:06

SELECTing Expressions

Time of First Successful Submission: 2026-03-09 05:07:22

Composite Conditions

Time of First Successful Submission: 2026-03-09 05:15:55

Reaching Your LIMITs

Time of First Successful Submission: 2026-03-09 05:20:08

Querying Metadata

Time of First Successful Submission: 2026-03-09 05:27:39

GCA CTF

11 / 104 8398 / 43655

Using the Terminal

Time of First Successful Submission: 2026-02-20 14:00:06

Using the VSCode Workspace

Time of First Successful Submission: 2026-02-21 02:55:28

Using the GUI Desktop

Time of First Successful Submission: 2026-02-21 03:00:41

Pasting into the Desktop

Time of First Successful Submission: 2026-02-21 03:02:44

Connecting over SSH

Time of First Successful Submission: 2026-02-21 03:07:10

Restarting Challenges

Time of First Successful Submission: 2026-02-21 03:17:54

Challenge Programs

Time of First Successful Submission: 2026-02-21 03:25:46

The Flag File

Time of First Successful Submission: 2026-02-21 03:30:00

Using Privileged Mode

Time of First Successful Submission: 2026-02-21 03:36:53

Persistent Home Directories - One

Time of First Successful Submission: 2026-02-21 03:47:25

Persistent Home Directories - Two

Time of First Successful Submission: 2026-02-21 03:48:29