Cracking the Cipher Grid
Cracking the Cipher Grid
Grid-based ciphers turn letters into coordinates, hiding messages inside a simple table of rows and columns. The Polybius square is the classic starting point: a 5x5 grid of the alphabet where each letter becomes a pair of numbers. This post walks through how the grid works, why it was useful for telegraph and signal transmission, and how to encode and decode a short message by hand. It also touches on why grid ciphers appeal to beginners learning cryptography, since the math is simple but the logic teaches core ideas like substitution and coordinate mapping that show up in far more advanced systems later on.
Reference: Polybius square (Wikipedia)
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