Cryptographic apparatus and method

Details Cryptographic apparatus and method Cryptographic apparatus and method

2007-02-13

2007-02-13

Arani, Taghi T. (Department: 2131)

Cryptography

Communication system using cryptography

Time segment interchange

C380S259000, C380S268000, C380S028000, C380S042000

Reexamination Certificate

active

09572790

ABSTRACT:
An encryption system comprises a pseudo-random number generator (KS) for generating a long pseudo-random sequence (S) from a shorter encryption key (K) and, if necessary, a nonce value (N), and a mixing function (MX) for combining the sequence with a plaintext message (P) on a block-by-block basis, where successive blocks (S(i)) of 128 bits of the sequence are combined with successive 64-bit blocks of plaintext (P(i)) to produce successive 64-bit blocks of ciphertext. The blockwise use of a long pseudo-random sequence preserves the advantages of a block cipher in terms of data confidentiality and data integrity, as well as benefiting from the speed advantages of a stream cipher.

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