Method and apparatus for generating a stream cipher

Details Method and apparatus for generating a stream cipher Method and apparatus for generating a stream cipher

H - Electricity

04

L

H04L 9/18 (2006.01) H04L 9/06 (2006.01) H04L 9/22 (2006.01)

Patent

CA 2474856

A code division multiple access (CDMA) is a type of spread-spectrum communication system having a plurality of subscriber units and at least one base station. In order for a first subscriber unit to communicate with a second subscriber unit, a transmitter unit of the first subscriber unit imprints a unique code upon transmission and the second subscriber unit includes a receiver, which uses the code to decode the transmission. In addition, each transmitter with a CDMA communication system includes a stream cipher generator for enciphering the voice and data communications. Each receiver within a CDMA communication system contains an identical or similar stream cipher generator, which is used to decipher the received enciphered communication. The present invention relates to a stream cipher generator having a plurality of linear feedback shift registers to produce a stream cipher for increasing security using ciphered messages.

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