发明名称 |
METHOD AND APPARATUS FOR SYNCHRONOUS STREAM CIPHER ENCRYPTION WITH RESERVED CODES |
摘要 |
<p>A method and apparatus for a signal encryption device constructed to perform synchronous stream cipher encryption for a sequence of input words with restricted codes. The encryption device includes a keystream generator for producing a sequence of pseudorandom words from a key, and an adder that is used to sum the output of the keystream generator and the input words. A lookup table of size substantially twice the number of possible input words provides encrypted codes excluding restricted codes from the summed signal. A signal encryption and decryption system is constructed by including a second keystream generator for producing a second sequence of pseudorandom words from the key, and a second adder to produce a second summed signal from the output of the second keystream generator and the encrypted codes. A corresponding lookup table provides decrypted codes excluding restricted codes from the second summed signal.</p> |
申请公布号 |
EP1994672(A2) |
申请公布日期 |
2008.11.26 |
申请号 |
EP20070757380 |
申请日期 |
2007.02.23 |
申请人 |
TEXAS INSTRUMENTS INCORPORATED |
发明人 |
FRITZ, MATTHEW, JOHN |
分类号 |
H04L9/00;H04L1/00;H04L9/26 |
主分类号 |
H04L9/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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