Web Reference: Mar 11, 2026 · Hill Cipher is a polygraphic substitution cipher based on linear algebra. In this method, each letter of the alphabet is represented by a number modulo 26, commonly using the scheme A = 0, B = 1, …, Z = 25. This page provides comprehensive Hill cipher examples with complete step-by-step solutions, including 2x2 and 3x3 encryption and decryption, keyword-to-matrix conversion, known-plaintext attack demonstrations, and detailed mathematical calculations. The Hill cipher is famous because it brings linear algebra into cryptography. Instead of substituting letters one at a time, it encrypts blocks (pairs, triples, etc.), which can better obscure single-letter frequencies.
YouTube Excerpt: In this video I walk through the basics of the
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