Method and apparatus for fast RC4-like encryption

Details Method and apparatus for fast RC4-like encryption Method and apparatus for fast RC4-like encryption

2007-11-13

2007-11-13

Barron, Gilberto (Department: 2132)

Cryptography

Communication system using cryptography

Data stream/substitution enciphering

C380S028000, C380S037000, C380S043000

Reexamination Certificate

active

10617632

ABSTRACT:
A method and apparatus for encrypting information. In one embodiment, a method for encrypting information includes obtaining a value A from an array having a plurality of values and determining a value B based on the value A in a first pipeline stage. In a second pipeline stage, a value V may be determined from the value A and the value B. The value V may then be exclusive ORed (XORed) with a data value that forms a portion of the information being encrypted. A first logic unit may include the first pipeline stage, while a second logic unit may include the second pipeline stage. The array may be stored in a plurality of flip-flops in one embodiment, or may be stored in one or more register files in a second embodiment. The method and apparatus may be used for decrypting information as well.

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