Method of and an apparatus for generating internal crypto-keys
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United States of America Patent
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Aug 21, 2001
Grant Date -
N/A
app pub date -
Oct 29, 1998
filing date -
Oct 31, 1997
priority date (Note) -
Expired
status (Latency Note)
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Abstract
To provide a method of generating internal crypto-keys to be set initially in a feedback-shift-registers of a pseudo-random-sequence generator of a stream cipher system with sufficient security and sufficiently high speed as well, the method comprises: a step of outputting m sets of first conversion results, obtaining i-th set of the first conversion results by processing (i-1)-th set of the first conversion results with a first one-way-function; a step of outputting m sets of second conversion results, obtaining i-th set of the second conversion results by processing (i-1)-th sets of the second conversion results with a second one-way function; and a step of outputting j-th internal crypto-key by XORing j-th set of the first conversion results and (m-j+1)-th set of the second conversion results.
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