Course 27 - Hacking Web Applications, Penetration Testing, CTF | Episode 8: Cryptography Fundamentals: Encoding and Ciphers

In this lesson, you’ll learn about:Data Representation and Encoding:ASCII: Uses 128 unique values to represent text characters in computing.Base64: Encodes binary data into text form for safe transfer across text-only channels like email or HTML.Numerical Systems in Computing:Binary (Base 2): Uses 0 and 1, fundamental to machine operations.Decimal (Base 10): Standard human-readable numbering.Hexadecimal (Base 16): Uses 0–9 and A–F, commonly used in memory addresses and color codes.Octal (Base 8): Uses digits 0–7, occasionally used in file permissions and legacy systems.Classic Substitution Ciphers:Caesar Cipher / Shift Cipher: Rotates letters by a fixed number of positions.ROT Variants:ROT13: Shifts letters by 13 positions.ROT5: Shifts numbers.ROT18: Combination of ROT13 for letters and ROT5 for numbers.ROT47: Extends rotation to letters, numbers, and keyboard symbols across ASCII.You can listen and download our episodes for free on more than 10 different platforms:https://linktr.ee/cybercode_academy