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Intro to Programming Languages

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Commands

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Intro to Cybersecurity

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Path Traversal 1

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Path Traversal 2

Time of First Successful Submission: 2026-05-07 00:26:19

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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Start Here

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Using the Terminal

Time of First Successful Submission: 2026-04-20 05:20:47


Linux Luminarium

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Intro to Commands

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implicit relative path

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home sweet home

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grepping for a needle in a haystack

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linking files

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Learning From Documentation

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Learning Complex Usage

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Matching with ?

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Matching with []

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Matching paths with []

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Computing 101

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Your First Register

Time of First Successful Submission: 2026-04-20 06:14:21

Your First Syscall

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Exit Codes

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Building Executables

Time of First Successful Submission: 2026-04-28 09:38:09

Moving Between Registers

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Loading From Memory

Time of First Successful Submission: 2026-04-28 10:53:03

More Loading Practice

Time of First Successful Submission: 2026-04-28 10:54:25

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

Time of First Successful Submission: 2026-04-28 11:30:22

Examining Memory

Time of First Successful Submission: 2026-04-28 11:31:49

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: 2026-05-04 00:59:50

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: 2026-05-05 01:21:48

... and again!

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Newline Troubles

Time of First Successful Submission: 2026-05-05 01:24:29

Reasoning about files

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Specifying Filenames

Time of First Successful Submission: 2026-05-05 01:28:14

Binary and Hex Encoding

Time of First Successful Submission: 2026-05-05 03:01:21

More Hex

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Decoding Hex

Time of First Successful Submission: 2026-05-05 12:49:10

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

Time of First Successful Submission: 2026-05-05 14:20:43

Dealing with Obfuscation 2

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Your First HTTP Request

Time of First Successful Submission: 2026-05-05 14:36:44

Reading Flask

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Commented Data

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HTTP Metadata

Time of First Successful Submission: 2026-05-05 14:43:42

HTTP (netcat)

Time of First Successful Submission: 2026-05-05 14:45:37

HTTP Paths (netcat)

Time of First Successful Submission: 2026-05-05 14:46:13

HTTP (curl)

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HTTP (python)

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HTTP Host Header (python)

Time of First Successful Submission: 2026-05-05 14:57:13

HTTP Host Header (curl)

Time of First Successful Submission: 2026-05-05 14:59:36

HTTP Host Header (netcat)

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

URL Encoding (netcat)

Time of First Successful Submission: 2026-05-05 23:53:00

HTTP GET Parameters

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Multiple HTTP Parameters (netcat)

Time of First Successful Submission: 2026-05-06 00:00:01

Multiple HTTP Parameters (curl)

Time of First Successful Submission: 2026-05-06 00:02:28

HTTP Forms

Time of First Successful Submission: 2026-05-06 00:31:25

HTTP Forms (curl)

Time of First Successful Submission: 2026-05-06 00:33:30

HTTP Forms (netcat)

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HTTP Forms (python)

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HTTP Forms Without Forms

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Multiple Form Fields (curl)

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Multiple Form Fields (netcat)

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HTTP Redirects (netcat)

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HTTP Redirects (curl)

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HTTP Redirects (python)

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HTTP Cookies (curl)

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HTTP Cookies (netcat)

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HTTP Cookies (python)

Time of First Successful Submission: 2026-05-06 01:31:36

Server State (python)

Time of First Successful Submission: 2026-05-06 01:32:27

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

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bzip2

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zip

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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

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nice

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timeout

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stdbuf

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setarch

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watch

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socat

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whiptail

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awk

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sed

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ed

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chown

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chmod

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cp

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mv

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perl

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python

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ruby

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bash

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date

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dmesg

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wc

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gcc

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as

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wget

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ssh-keygen

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SQL Queries

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Filtering SQL

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Choosing Columns

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Exclusionary Filtering

Time of First Successful Submission: 2026-05-06 12:06:55

Filtering Strings

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Filtering on Expressions

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SELECTing Expressions

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Composite Conditions

Time of First Successful Submission: 2026-05-06 12:30:52

Reaching Your LIMITs

Time of First Successful Submission: 2026-05-06 12:35:22

Querying Metadata

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GCA CTF

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Using the Terminal

Time of First Successful Submission: 2026-04-20 05:20:47

Connecting over SSH

Time of First Successful Submission: 2026-04-20 05:25:18