Block cryptographic method for encrypting/decrypting messages and cryptographic devices for implementing this method
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United States of America Patent
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Aug 16, 2022
Grant Date -
Dec 21, 2017
app pub date -
Dec 1, 2015
filing date -
Dec 3, 2014
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Abstract
A block cipher method and apparatus using round repetition for providing, from a plaintext message, a ciphertext message and a global tag is disclosed; the plaintext message is converted into a plurality of ordered plaintext blocks which are successively processed during a round for computing: a cryptogram by encrypting input data using a single cryptographic key, said cryptogram comprising a first segment and a second segment; a ciphertext block by performing a first operation using, as operands: said first segment said current plaintext block and said second segment; at each next round said input data is newly determined based on the current ciphertext block and an updated reproducible data; the ciphertext message is determined by concatenating the ciphertext blocks and the global tag by a second operation using computed authentication local tags as operands.
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