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Intro to Programming Languages

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Lecture 1.1. Course Environment

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Lab 1.1 - Start Terminal

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Lecture 1.2. Linux Shells

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Lecture 1.3. Linux File System

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Lecture 1.4. Executing Programs

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Lecture 1.5. Common Commands

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Lab 1.5.2 - Using ls and cd

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Lab 1.5.3 - Using grep

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P1.0 Level 1 Open /flag in VSCode

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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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P1.0 Level 5 read

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Cat

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Ls

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Ls All

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P1.0 Level 2 list dir

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Find

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P1.0 Level 3 change dir

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P1.0 Level 4 move

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P1.0 Level 6 grep

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P1.0 Level 7 execute

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Piping Echo

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Piping Stdout

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Piping Stdin

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P1.0 Level 8 stdin

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P1.0 Level 9 pipe

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P1.0 Level 10 args

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Lecture 2.1.1.0 Paradigms and C

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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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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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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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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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AES-ECB-CPA-Suffix

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AES-ECB-CPA-Prefix

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AES-ECB-CPA-Prefix-2

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AES-ECB-CPA-Prefix-Miniboss

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AES-ECB-CPA-Prefix-Boss

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AES-CBC

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AES-CBC Tampering

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AES-CBC Resizing

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AES-CBC-POA-Partial-Block

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AES-CBC-POA-Full-Block

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AES-CBC-POA-Multi-Block

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AES-CBC-POA-Encrypt

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AES-CBC-POA-Encrypt-2

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DHKE

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DHKE-to-AES

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RSA 1

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RSA 2

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RSA 3

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RSA 4

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RSA Signatures

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SHA 1

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SHA 2

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TLS 1

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TLS 2

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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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Internal State Mini (C)

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Internal State Mini (x86)

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Internal State (C)

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Internal State (x86)

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File Formats: Directives (C)

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File Formats: Directives (x86)

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The Patch Directive

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Optimizing for Space

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Storage and Retrieval

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Extracting Knowledge

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Advanced Sprites

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Accessing Resources

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Unsafe Animations

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Interoperability: Patching Data

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Patching Code

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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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PIEs (hard)

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String Lengths (easy)

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String Lengths (hard)

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Basic Shellcode

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NOP Sleds

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NULL-Free Shellcode

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Hijack to (Mapped) Shellcode (easy)

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Hijack to (Mapped) Shellcode (hard)

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Hijack to Shellcode (easy)

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Hijack to Shellcode (hard)

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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

Time of First Successful Submission: 2026-01-28 09:48:06

Scripting with Multiple Conditions

Time of First Successful Submission: 2026-01-28 09:52:50

Reading Shell Scripts

Time of First Successful Submission: 2026-01-28 09:57:20

Launching Screen

Time of First Successful Submission: 2026-01-28 10:02:28

Detaching and Attaching

Time of First Successful Submission: 2026-01-28 10:06:09

Finding Sessions

Time of First Successful Submission: 2026-01-28 10:09:01

Switching Windows

Time of First Successful Submission: 2026-01-28 10:11:59

Detaching and Attaching (tmux)

Time of First Successful Submission: 2026-01-28 10:13:50

Switching Windows (tmux)

Time of First Successful Submission: 2026-01-28 10:23:39

The PATH Variable

Time of First Successful Submission: 2026-01-30 13:44:14

Setting PATH

Time of First Successful Submission: 2026-01-30 13:50:25

Finding Commands

Time of First Successful Submission: 2026-01-30 13:56:15

Adding Commands

Time of First Successful Submission: 2026-01-30 14:19:58

Hijacking Commands

Time of First Successful Submission: 2026-01-30 14:33:51

Bashrc Backdoor

Time of First Successful Submission: 2026-02-05 04:52:26

Sniffing Input

Time of First Successful Submission: 2026-02-05 05:07:56

Overshared Directories

Time of First Successful Submission: 2026-02-05 05:35:49

Tricky Linking

Time of First Successful Submission: 2026-02-05 05:44:03

Sniffing Process Arguments

Time of First Successful Submission: 2026-02-05 05:57:01

Snooping on Configurations

Time of First Successful Submission: 2026-02-05 06:01:39

The Fork Bomb

Time of First Successful Submission: 2026-02-06 14:24:18

Disk-Space Doomsday

Time of First Successful Submission: 2026-02-06 14:39:45

Computing 101

94 / 94 485 / 22332

Your First Register

Time of First Successful Submission: 2026-04-17 05:54:35

Your First Syscall

Time of First Successful Submission: 2026-04-17 05:57:55

Exit Codes

Time of First Successful Submission: 2026-04-17 06:00:37

Building Executables

Time of First Successful Submission: 2026-04-22 08:25:01

Moving Between Registers

Time of First Successful Submission: 2026-04-22 08:32:03

Loading From Memory

Time of First Successful Submission: 2026-04-22 08:59:05

More Loading Practice

Time of First Successful Submission: 2026-04-22 08:59:46

Dereferencing Pointers

Time of First Successful Submission: 2026-04-22 09:02:11

Dereferencing Yourself

Time of First Successful Submission: 2026-04-22 09:03:09

Dereferencing with Offsets

Time of First Successful Submission: 2026-04-22 09:04:51

Stored Addresses

Time of First Successful Submission: 2026-04-22 09:05:49

Double Dereference

Time of First Successful Submission: 2026-04-22 09:07:53

The Stack

Time of First Successful Submission: 2026-04-22 09:11:19

Stack Offsets

Time of First Successful Submission: 2026-04-22 09:12:48

Program Arguments on the Stack

Time of First Successful Submission: 2026-04-22 09:14:46

Popping From the Stack

Time of First Successful Submission: 2026-04-22 09:18:07

Disassembling Programs

Time of First Successful Submission: 2026-04-22 09:41:54

Tracing Syscalls

Time of First Successful Submission: 2026-04-22 09:50:46

Starting GDB

Time of First Successful Submission: 2026-04-22 09:52:36

Quitting GDB

Time of First Successful Submission: 2026-04-22 09:53:06

Starting Programs in GDB

Time of First Successful Submission: 2026-04-22 09:58:23

Disassembling in GDB

Time of First Successful Submission: 2026-04-22 10:00:04

Stepping Through Instructions

Time of First Successful Submission: 2026-04-22 10:02:00

Reading Register Values

Time of First Successful Submission: 2026-04-22 10:03:01

Popping Stack Values

Time of First Successful Submission: 2026-04-22 10:05:17

Examining Memory

Time of First Successful Submission: 2026-04-22 10:07:47

Examining Stack Pointers

Time of First Successful Submission: 2026-04-22 10:12:19

Cooperative Debugging

Time of First Successful Submission: 2026-04-22 10:16:06

Writing Output

Time of First Successful Submission: 2026-04-22 10:30:35

Chaining Syscalls

Time of First Successful Submission: 2026-04-22 10:33:02

Writing Strings

Time of First Successful Submission: 2026-04-22 10:34:47

Reading Data

Time of First Successful Submission: 2026-04-22 10:49:48

Opening Files

Time of First Successful Submission: 2026-04-22 10:54:21

Hardcoding the Filename

Time of First Successful Submission: 2026-04-22 10:57:24

Comparing Values

Time of First Successful Submission: 2026-04-25 13:17:36

Comparing Characters

Time of First Successful Submission: 2026-04-25 13:19:51

Conditional Control Flow

Time of First Successful Submission: 2026-04-25 13:25:09

Comparing Strings

Time of First Successful Submission: 2026-04-25 13:32:17

Reverse the Password

Time of First Successful Submission: 2026-04-25 13:40:50

Conditionals Without Conditionals

Time of First Successful Submission: 2026-04-25 13:53:39

Looping

Time of First Successful Submission: 2026-04-25 14:04:13

Reverse the Calculation

Time of First Successful Submission: 2026-04-25 14:20:52

Reverse the Reverse

Time of First Successful Submission: 2026-04-25 14:23:50

Dealing with Bitwise Operations

Time of First Successful Submission: 2026-04-25 14:29:29

Loops on Data

Time of First Successful Submission: 2026-04-25 14:34:17

set-register

Time of First Successful Submission: 2026-04-25 14:53:22

set-multiple-registers

Time of First Successful Submission: 2026-04-25 14:56:27

add-to-register

Time of First Successful Submission: 2026-04-25 14:58:14

linear-equation-registers

Time of First Successful Submission: 2026-04-25 15:06:19

integer-division

Time of First Successful Submission: 2026-04-25 15:14:29

modulo-operation

Time of First Successful Submission: 2026-04-25 15:16:42

set-upper-byte

Time of First Successful Submission: 2026-04-25 15:18:25

efficient-modulo

Time of First Successful Submission: 2026-04-25 15:30:06

byte-extraction

Time of First Successful Submission: 2026-04-25 15:46:36

bitwise-and

Time of First Successful Submission: 2026-04-27 20:47:54

check-even

Time of First Successful Submission: 2026-04-27 21:00:54

memory-read

Time of First Successful Submission: 2026-04-27 21:08:56

memory-write

Time of First Successful Submission: 2026-04-27 21:10:01

memory-increment

Time of First Successful Submission: 2026-04-27 21:15:37

byte-access

Time of First Successful Submission: 2026-04-27 21:52:28

memory-size-access

Time of First Successful Submission: 2026-04-27 22:05:48

little-endian-write

Time of First Successful Submission: 2026-04-27 23:23:27

memory-sum

Time of First Successful Submission: 2026-04-27 23:27:07

stack-subtraction

Time of First Successful Submission: 2026-04-27 23:34:12

swap-stack-values

Time of First Successful Submission: 2026-04-27 23:41:08

average-stack-values

Time of First Successful Submission: 2026-04-27 23:57:14

absolute-jump

Time of First Successful Submission: 2026-04-28 01:10:33

relative-jump

Time of First Successful Submission: 2026-04-28 02:21:52

jump-trampoline

Time of First Successful Submission: 2026-05-01 13:18:41

conditional-jump

Time of First Successful Submission: 2026-05-01 13:29:59

indirect-jump

Time of First Successful Submission: 2026-05-01 13:40:45

average-loop

Time of First Successful Submission: 2026-05-01 13:49:51

count-non-zero

Time of First Successful Submission: 2026-05-01 13:53:16

string-lower

Time of First Successful Submission: 2026-05-01 13:56:08

most-common-byte

Time of First Successful Submission: 2026-05-01 13:57:15

Exit

Time of First Successful Submission: 2026-05-04 07:16:56

Socket

Time of First Successful Submission: 2026-05-04 08:28:32

Bind

Time of First Successful Submission: 2026-05-04 08:54:59

Listen

Time of First Successful Submission: 2026-05-09 14:30:05

Accept

Time of First Successful Submission: 2026-05-09 14:30:56

Static Response

Time of First Successful Submission: 2026-05-09 14:32:28

Dynamic Response

Time of First Successful Submission: 2026-05-09 14:33:23

Iterative GET Server

Time of First Successful Submission: 2026-05-09 14:34:03

Concurrent GET Server

Time of First Successful Submission: 2026-05-09 14:35:33

Concurrent POST Server

Time of First Successful Submission: 2026-05-09 14:38:58

Web Server

Time of First Successful Submission: 2026-05-09 14:40:04

Debugging Programs

Time of First Successful Submission: 2026-05-01 14:37:39

Inspecting Registers

Time of First Successful Submission: 2026-05-01 14:40:40

Examining Memory

Time of First Successful Submission: 2026-05-01 14:51:16

Setting Breakpoints

Time of First Successful Submission: 2026-05-03 23:22:19

GDB Scripting

Time of First Successful Submission: 2026-05-03 23:27:43

Modifying Data

Time of First Successful Submission: 2026-05-04 05:38:16

Modifying Execution

Time of First Successful Submission: 2026-05-04 05:41:14

Broken Functions

Time of First Successful Submission: 2026-05-04 05:52:24

Playing With Programs

65 / 116 4476 / 23768

What's the password?

Time of First Successful Submission: 2026-02-07 16:03:47

... and again!

Time of First Successful Submission: 2026-02-07 16:04:44

Newline Troubles

Time of First Successful Submission: 2026-02-11 19:34:10

Reasoning about files

Time of First Successful Submission: 2026-02-11 19:38:03

Specifying Filenames

Time of First Successful Submission: 2026-02-14 14:12:06

Binary and Hex Encoding

Time of First Successful Submission: 2026-02-19 02:38:56

More Hex

Time of First Successful Submission: 2026-02-19 02:41:04

Decoding Hex

Time of First Successful Submission: 2026-02-19 02:48:13

Decoding Practice

Time of First Successful Submission: 2026-02-19 02:56:28

Encoding Practice

Time of First Successful Submission: 2026-02-19 02:58:53

Hex-encoding ASCII

Time of First Successful Submission: 2026-02-19 03:07:08

Nested Encoding

Time of First Successful Submission: 2026-02-19 03:13:16

Hex-encoding UTF-8

Time of First Successful Submission: 2026-02-19 03:20:21

UTF Mixups

Time of First Successful Submission: 2026-02-19 03:25:49

Modifying Encoded Data

Time of First Successful Submission: 2026-02-19 03:31:55

Decoding Base64

Time of First Successful Submission: 2026-02-19 07:06:56

Encoding Base64

Time of First Successful Submission: 2026-02-19 07:52:15

Dealing with Obfuscation

Time of First Successful Submission: 2026-02-19 08:43:12

Dealing with Obfuscation 2

Time of First Successful Submission: 2026-02-19 08:55:38

Your First HTTP Request

Time of First Successful Submission: 2026-02-20 00:35:20

Reading Flask

Time of First Successful Submission: 2026-02-20 00:41:39

Commented Data

Time of First Successful Submission: 2026-02-20 00:45:29

HTTP Metadata

Time of First Successful Submission: 2026-02-20 00:53:55

HTTP (netcat)

Time of First Successful Submission: 2026-02-20 01:09:13

HTTP Paths (netcat)

Time of First Successful Submission: 2026-02-20 01:13:29

HTTP (curl)

Time of First Successful Submission: 2026-02-20 01:21:36

HTTP (python)

Time of First Successful Submission: 2026-02-20 01:28:28

HTTP Host Header (python)

Time of First Successful Submission: 2026-02-20 01:54:44

HTTP Host Header (curl)

Time of First Successful Submission: 2026-02-20 02:02:01

HTTP Host Header (netcat)

Time of First Successful Submission: 2026-02-20 02:13:01

URL Encoding (netcat)

Time of First Successful Submission: 2026-02-23 15:54:23

HTTP GET Parameters

Time of First Successful Submission: 2026-02-23 16:07:17

Multiple HTTP Parameters (netcat)

Time of First Successful Submission: 2026-02-23 16:18:53

Multiple HTTP Parameters (curl)

Time of First Successful Submission: 2026-02-23 16:22:02

HTTP Forms

Time of First Successful Submission: 2026-02-23 16:27:47

HTTP Forms (curl)

Time of First Successful Submission: 2026-02-23 16:37:13

HTTP Forms (netcat)

Time of First Successful Submission: 2026-02-23 17:20:39

HTTP Forms (python)

Time of First Successful Submission: 2026-02-23 18:02:15

HTTP Forms Without Forms

Time of First Successful Submission: 2026-03-04 03:13:33

Multiple Form Fields (curl)

Time of First Successful Submission: 2026-03-04 03:15:08

Multiple Form Fields (netcat)

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

HTTP Redirects (netcat)

Time of First Successful Submission: 2026-03-04 05:58:50

HTTP Redirects (curl)

Time of First Successful Submission: 2026-03-04 06:02:29

HTTP Redirects (python)

Time of First Successful Submission: 2026-03-04 06:14:08

HTTP Cookies (curl)

Time of First Successful Submission: 2026-03-04 06:18:55

HTTP Cookies (netcat)

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

HTTP Cookies (python)

Time of First Successful Submission: 2026-03-04 06:35:57

Server State (python)

Time of First Successful Submission: 2026-03-04 06:45:53

Listening Web

Time of First Successful Submission: 2026-03-04 06:51:46

Speaking Redirects

Time of First Successful Submission: 2026-03-05 07:05:53

JavaScript Redirects

Time of First Successful Submission: 2026-03-05 07:16:00

Including JavaScript

Time of First Successful Submission: 2026-03-05 07:35:30

HTTP (javascript)

Time of First Successful Submission: 2026-03-13 00:44:26

HTTP Get Parameters (javascript)

Time of First Successful Submission: 2026-03-13 01:17:19

HTTP Forms (javascript)

Time of First Successful Submission: 2026-03-13 01:22:13

SQL Queries

Time of First Successful Submission: 2026-03-13 02:08:23

Filtering SQL

Time of First Successful Submission: 2026-03-13 02:14:12

Choosing Columns

Time of First Successful Submission: 2026-03-13 02:20:13

Exclusionary Filtering

Time of First Successful Submission: 2026-03-13 02:29:24

Filtering Strings

Time of First Successful Submission: 2026-03-13 02:34:33

Filtering on Expressions

Time of First Successful Submission: 2026-03-13 02:51:40

SELECTing Expressions

Time of First Successful Submission: 2026-03-13 03:17:07

Composite Conditions

Time of First Successful Submission: 2026-03-13 03:27:22

Reaching Your LIMITs

Time of First Successful Submission: 2026-03-13 03:39:26

Querying Metadata

Time of First Successful Submission: 2026-03-13 03:44:01

GCA CTF

12 / 104 1106 / 45598

Using the Terminal

Time of First Successful Submission: 2026-01-16 03:55:05

Using the VSCode Workspace

Time of First Successful Submission: 2026-01-16 03:57:41

Using the GUI Desktop

Time of First Successful Submission: 2026-01-16 04:00:01

Pasting into the Desktop

Time of First Successful Submission: 2026-01-16 04:04:56

Connecting over SSH

Time of First Successful Submission: 2026-01-16 04:51:03

Restarting Challenges

Time of First Successful Submission: 2026-01-16 04:52:50

Getting Help

Time of First Successful Submission: 2026-01-16 11:42:36

Challenge Programs

Time of First Successful Submission: 2026-01-16 06:36:31

The Flag File

Time of First Successful Submission: 2026-01-16 06:37:54

Using Privileged Mode

Time of First Successful Submission: 2026-01-16 06:58:24

Persistent Home Directories - One

Time of First Successful Submission: 2026-01-16 07:05:55

Persistent Home Directories - Two

Time of First Successful Submission: 2026-01-16 07:09:10