Answer by fgrieu for Cryptanalysis of a feedback shift reigister with an S-box
why is this cryptosystem "keyed by the contents of the S-box" ?It means that the content of the S-box is assumed secret, and part of the key (in addition to whatever part of the initial state is not a...
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Cryptanalysis of a feedback shift reigister with an S-box
I’m just getting started on learning cryptography and here is a problem from exercises about which I'm totally confused:This is a 32-bit feedback shift register to encrypt some message. The register...
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