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The Art of Inference: Decoding JN-25 When the Full Key Remained Hidden
The Japanese naval code JN-25 was a cryptographic titan. It was a "superenciphered code," meaning it required two distinct steps to decrypt: first, a codebook replaced words and phrases with five-digit numbers, and then those numbers were scrambled by a subtractor table. American cryptanalysts at Station HYPO in Hawaii never "read" the code in ...
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