Secret Codes: A History of Cryptography (Part 1)

3-Second Blueprint (English)

1. Unlike steganography, which hides a message's physical existence, cryptography obscures meaning via letter transposition or substitution.
2. Caesar shifts allow only 25 keys, whereas keyword-based monoalphabetic substitution ciphers create vast permutations with memorable keys.
3. Cryptanalysts break monoalphabetic ciphers using frequency analysis by matching recurring symbols to common letters like E and T in text.