Apparatus for providing improved encryption protection in a communication system
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United States of America Patent
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-
Jan 11, 2000
Issued Date -
N/A
app pub date -
Nov 25, 1997
filing date -
Feb 24, 1995
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An encryption apparatus and method generate a unique keystream output value for every frame of bearer traffic to provide encryption protection in a communications system. The keystream output value is generated from the following equations: x(n+1).sub.low ={x(n).sub.low *R1.sub.low +R2.sub.low } mod R3.sub.low x(n+1).sub.high ={x(n).sub.high *R2.sub.high +R1.sub.high } mod R3.sub.high where R1, R2, and R3 are linear feedback shift registers and x(n) and x(n+1) represent previous and current output values.
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