Web Reference: Welcome to my breakdown of the Hill 2x2 cipher, one of the more challenging but fascinating ciphers featured in the Science Olympiad Codebusters event! A block cipher on letter pairs using 2×2 matrix multiplication modulo 26. Convert letters A–Z to numbers 0–25, group plaintext into pairs (pad with X if needed), then for each pair P= [p1;p2] compute ciphertext C=K·P (mod 26) with an invertible 2×2 key K. It must be either 4 or 9 characters long. The Question Text doesn't indicate that the text should be encoded. Show suggested Question Text.
YouTube Excerpt: Welcome to my breakdown of the
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