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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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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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Connect

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Send

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Shutdown

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Listen

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Scan 1

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Scan 2

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Monitor 1

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Monitor 2

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Sniffing Cookies

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Network Configuration

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Firewall 1

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Firewall 2

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Firewall 3

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Denial of Service 1

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Denial of Service 2

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Denial of Service 3

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Ethernet

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IP

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TCP

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TCP Handshake

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UDP

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UDP 2

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UDP Spoofing 1

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UDP Spoofing 2

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UDP Spoofing 3

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UDP Spoofing 4

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ARP

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Intercept

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Man-in-the-Middle

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XOR

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XORing Hex

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XORing ASCII

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XORing ASCII Strings

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One-time Pad

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One-time Pad Tampering

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Many-time Pad

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AES

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AES-ECB-CPA

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AES-ECB-CPA-HTTP

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AES-ECB-CPA-HTTP (base64)

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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)

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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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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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Computing 101

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Your First Register

Time of First Successful Submission: 2026-02-21 13:42:21

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

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Playing With Programs

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What's the password?

Time of First Successful Submission: 2026-03-04 15:48:05

... and again!

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Newline Troubles

Time of First Successful Submission: 2026-03-04 15:52:25

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

Time of First Successful Submission: 2026-03-05 18:42:59

HTTP Metadata

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HTTP (netcat)

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HTTP Paths (netcat)

Time of First Successful Submission: 2026-03-05 19:03:10

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)

Time of First Successful Submission: 2026-03-06 15:57:14

Multiple HTTP Parameters (curl)

Time of First Successful Submission: 2026-03-06 16:01:14

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)

Time of First Successful Submission: 2026-03-06 18:00:49

HTTP Cookies (python)

Time of First Successful Submission: 2026-03-06 18:05:02

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

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xxd

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base32

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base64

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split

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gzip

Time of First Successful Submission: 2026-03-07 11:48:28

bzip2

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zip

Time of First Successful Submission: 2026-03-07 12:02:31

tar

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ar

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cpio

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genisoimage

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env

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find

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make

Time of First Successful Submission: 2026-03-07 14:06:11

nice

Time of First Successful Submission: 2026-03-07 14:10:40

timeout

Time of First Successful Submission: 2026-03-07 14:13:42

stdbuf

Time of First Successful Submission: 2026-03-07 14:22:52

setarch

Time of First Successful Submission: 2026-03-07 14:26:36

watch

Time of First Successful Submission: 2026-03-07 14:28:32

socat

Time of First Successful Submission: 2026-03-07 14:31:11

whiptail

Time of First Successful Submission: 2026-03-07 14:33:38

awk

Time of First Successful Submission: 2026-03-07 14:35:12

sed

Time of First Successful Submission: 2026-03-07 14:36:01

ed

Time of First Successful Submission: 2026-03-07 14:41:21

chown

Time of First Successful Submission: 2026-03-07 14:44:49

chmod

Time of First Successful Submission: 2026-03-07 14:48:02

cp

Time of First Successful Submission: 2026-03-07 14:58:11

mv

Time of First Successful Submission: 2026-03-07 15:02:30

perl

Time of First Successful Submission: 2026-03-07 15:04:25

python

Time of First Successful Submission: 2026-03-07 15:08:44

ruby

Time of First Successful Submission: 2026-03-07 15:13:50

bash

Time of First Successful Submission: 2026-03-07 15:14:38

date

Time of First Successful Submission: 2026-03-07 15:15:52

dmesg

Time of First Successful Submission: 2026-03-07 15:17:09

wc

Time of First Successful Submission: 2026-03-07 15:18:36

gcc

Time of First Successful Submission: 2026-03-07 15:25:06

as

Time of First Successful Submission: 2026-03-07 15:25:43

wget

Time of First Successful Submission: 2026-03-07 15:28:28

ssh-keygen

Time of First Successful Submission: 2026-03-07 15:52:34

SQL Queries

Time of First Successful Submission: 2026-03-07 16:01:07

Filtering SQL

Time of First Successful Submission: 2026-03-07 16:19:22

Choosing Columns

Time of First Successful Submission: 2026-03-07 16:30:57

Exclusionary Filtering

Time of First Successful Submission: 2026-03-07 16:39:33

Filtering Strings

Time of First Successful Submission: 2026-03-07 16:42:54

Filtering on Expressions

Time of First Successful Submission: 2026-03-07 16:56:53

SELECTing Expressions

Time of First Successful Submission: 2026-03-07 17:24:19

Composite Conditions

Time of First Successful Submission: 2026-03-07 17:37:46

Reaching Your LIMITs

Time of First Successful Submission: 2026-03-07 17:42:10

Querying Metadata

Time of First Successful Submission: 2026-03-07 17:54:09


GCA CTF

10 / 104 19763 / 43659


Using the Terminal

Time of First Successful Submission: 2026-03-04 16:52:27

Using the VSCode Workspace

Time of First Successful Submission: 2026-03-04 16:53:42

Using the GUI Desktop

Time of First Successful Submission: 2026-03-04 16:56:24

Pasting into the Desktop

Time of First Successful Submission: 2026-03-04 16:58:28

Restarting Challenges

Time of First Successful Submission: 2026-03-04 17:02:02

Challenge Programs

Time of First Successful Submission: 2026-02-01 13:04:35

The Flag File

Time of First Successful Submission: 2026-02-01 13:21:53

Using Privileged Mode

Time of First Successful Submission: 2026-02-01 13:25:45

Persistent Home Directories - One

Time of First Successful Submission: 2026-02-01 13:35:04

Persistent Home Directories - Two

Time of First Successful Submission: 2026-02-01 13:35:43