Stream cipher encryption and message authentication

Details Stream cipher encryption and message authentication Stream cipher encryption and message authentication

2005-02-17

2009-11-24

Jung, David Y (Department: 2434)

Cryptography

Communication system using cryptography

Data stream/substitution enciphering

C380S043000, C380S255000

Reexamination Certificate

active

07623656

ABSTRACT:
Stream cipher encryption and message authentication. Stream cipher encryption is performed by generating a keystream at the transmitting end from a state value, applying the keystream to plaintext to generate an encrypted message block having at least a portion of the plaintext converted to ciphertext, and updating the state value as a function of said at least a portion of the plaintext. Stream cipher decryption is performed by generating a keystream at the receiving end from the same state value, applying the keystream to the encrypted message block to convert the ciphertext to plaintext, and updating the state value as a function of the plaintext. Message authentication techniques are also described.

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