lynnyaboy

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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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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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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CSRF 1

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CSRF 2

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CSRF 3

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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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A Basic cIMG (Python)

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A Basic cIMG (C)

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A Basic cIMG (x86)

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Your First Overflow (easy)

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Your First Overflow (hard)

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Precision (easy)

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Precision (hard)

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Variable Control (easy)

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Variable Control (hard)

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Control Hijack (easy)

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Control Hijack (hard)

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Tricky Control Hijack (easy)

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Tricky Control Hijack (hard)

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PIEs (easy)

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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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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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Sniffing Process Arguments

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Snooping on Configurations

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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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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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Debugging Programs

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Inspecting Registers

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Examining Memory

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Setting Breakpoints

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Playing With Programs

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What's the password?

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... and again!

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Newline Troubles

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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

Time of First Successful Submission: 2026-01-30 19:21:20

Modifying Encoded Data

Time of First Successful Submission: 2026-01-30 19:43:14

Decoding Base64

Time of First Successful Submission: 2026-01-30 20:12:05

Encoding Base64

Time of First Successful Submission: 2026-01-30 20:17:32

Dealing with Obfuscation

Time of First Successful Submission: 2026-01-30 20:31:30

Dealing with Obfuscation 2

Time of First Successful Submission: 2026-01-30 20:40:48

Your First HTTP Request

Time of First Successful Submission: 2026-01-23 00:22:56

Reading Flask

Time of First Successful Submission: 2026-01-23 00:44:13

Commented Data

Time of First Successful Submission: 2026-01-23 00:51:33

HTTP Metadata

Time of First Successful Submission: 2026-01-23 00:53:02

HTTP (netcat)

Time of First Successful Submission: 2026-01-23 01:10:19

HTTP Paths (netcat)

Time of First Successful Submission: 2026-01-23 01:12:46

HTTP (curl)

Time of First Successful Submission: 2026-01-23 01:19:55

HTTP (python)

Time of First Successful Submission: 2026-01-23 01:39:49

HTTP Host Header (python)

Time of First Successful Submission: 2026-01-30 21:29:12

HTTP Host Header (curl)

Time of First Successful Submission: 2026-01-30 21:41:24

HTTP Host Header (netcat)

Time of First Successful Submission: 2026-01-30 21:48:15

URL Encoding (netcat)

Time of First Successful Submission: 2026-01-30 22:01:28

HTTP GET Parameters

Time of First Successful Submission: 2026-01-30 22:11:34

Multiple HTTP Parameters (netcat)

Time of First Successful Submission: 2026-01-30 22:18:29

Multiple HTTP Parameters (curl)

Time of First Successful Submission: 2026-01-31 02:12:26

HTTP Forms

Time of First Successful Submission: 2026-01-25 19:23:17

HTTP Forms (curl)

Time of First Successful Submission: 2026-01-31 02:24:26

HTTP Forms (netcat)

Time of First Successful Submission: 2026-01-31 02:59:06

HTTP Forms (python)

Time of First Successful Submission: 2026-01-31 03:18:16

HTTP Forms Without Forms

Time of First Successful Submission: 2026-01-31 03:35:50

Multiple Form Fields (curl)

Time of First Successful Submission: 2026-01-31 03:52:19

Multiple Form Fields (netcat)

Time of First Successful Submission: 2026-01-31 04:11:17

HTTP Redirects (netcat)

Time of First Successful Submission: 2026-01-31 04:15:19

HTTP Redirects (curl)

Time of First Successful Submission: 2026-01-31 04:17:38

HTTP Redirects (python)

Time of First Successful Submission: 2026-01-31 04:21:05

HTTP Cookies (curl)

Time of First Successful Submission: 2026-01-31 04:26:22

HTTP Cookies (netcat)

Time of First Successful Submission: 2026-01-31 04:31:37

HTTP Cookies (python)

Time of First Successful Submission: 2026-01-31 04:35:31

Server State (python)

Time of First Successful Submission: 2026-01-31 04:42:04

Listening Web

Time of First Successful Submission: 2026-01-31 16:12:42

SQL Queries

Time of First Successful Submission: 2026-01-23 02:47:01

Filtering SQL

Time of First Successful Submission: 2026-01-23 02:54:48

Choosing Columns

Time of First Successful Submission: 2026-01-23 03:02:15

Exclusionary Filtering

Time of First Successful Submission: 2026-01-23 03:19:17

Filtering Strings

Time of First Successful Submission: 2026-01-23 03:20:32

Filtering on Expressions

Time of First Successful Submission: 2026-01-23 03:27:56

SELECTing Expressions

Time of First Successful Submission: 2026-01-23 03:38:43

Composite Conditions

Time of First Successful Submission: 2026-01-25 18:36:24

Reaching Your LIMITs

Time of First Successful Submission: 2026-01-25 18:43:37

Querying Metadata

Time of First Successful Submission: 2026-01-25 18:57:52

GCA CTF

5 / 104 32346 / 43656

Using the Terminal

Time of First Successful Submission: 2026-01-14 22:10:32

Using the VSCode Workspace

Time of First Successful Submission: 2026-01-14 22:12:05

Using the GUI Desktop

Time of First Successful Submission: 2026-01-14 22:14:22

Pasting into the Desktop

Time of First Successful Submission: 2026-01-14 22:16:37

Restarting Challenges

Time of First Successful Submission: 2026-01-14 22:18:54