Method of designing optimum encryption function and...

Cryptography – Particular algorithmic function encoding – Public key

Reexamination Certificate

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Reexamination Certificate

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07447311

ABSTRACT:
A method of designing an optimum encryption algorithm and an optimized encryption apparatus are disclosed. In the encryption apparatus, a function block produces a first ciphertext of length2nby encrypting a first plaintext of length2nwith an encryption code of length4ngenerated from a key scheduler, and a second ciphertext of length m by encrypting the first ciphertext with a second plaintext of length m under the control of a controller. A memory stores the second ciphertext.

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