Learn how to implement a classic substitution cipher in C! This step-by-step tutorial walks you through encoding and decoding messages by replacing each letter with another according to a fixed key. A ...
In 1854, Sir Charles Wheatstone invented the cipher known as "Playfair," named for his friend Lyon Playfair, first Baron Playfair of St. Andrews, who popularized and promoted the cipher. Its ...
A recent study published in the journal Cryptologia presents what its author calls the Naibbe cipher, a manual substitution cipher system that, as he demonstrates, is capable of taking texts in Latin ...
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