Cryptography • • By LetterGen Team
Introduction to Classical Ciphers and Random Letters
Understand Caesar ciphers, substitution alphabets, and how random letter keys secure communication.
From Caesar’s military orders to modern encryption, letters have served as the foundational building blocks of secure communications.
The Monoalphabetic Substitution Cipher
In a substitution cipher, the 26 letters of the standard alphabet are mapped to a randomly shuffled permutation of the alphabet. Generating a random 26-letter key with zero repetitions creates 403 septillion possible permutations, rendering brute-force attacks difficult without frequency analysis.