发明名称 |
Method and apparatus for synchronous stream cipher encryption with reserved codes |
摘要 |
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.
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申请公布号 |
US7734044(B2) |
申请公布日期 |
2010.06.08 |
申请号 |
US20060360138 |
申请日期 |
2006.02.23 |
申请人 |
TEXAS INSTRUMENTS INCORPORATED |
发明人 |
FRITZ MATTHEW JOHN |
分类号 |
H04L9/18;H04L9/00;H04L9/20;H04L9/22 |
主分类号 |
H04L9/18 |
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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