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superencryption

cryptography

Learn about this topic in these articles:

history of product ciphers

In product cipher
…a final transposition, known as superencryption. One of the most famous field ciphers of all time was a fractionation system, the ADFGVX cipher employed by the German army during World War I. This system used a 6 × 6 matrix to substitution-encrypt the 26 letters and 10 digits into pairs…
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