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why these specific values used to initialize ipad & opad in HMAC [duplicate]
Possible Duplicate:
What do the magic numbers 0x5c and 0x36 in the opad/ipad calc in HMAC do?
I'm reading the book Network Security Essentials written by William Stallings.
in this book,in ...
4
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Is SHA1 secure with such many inputs Z that Z = constant secret X + variable public Y?
Let me ask whether SHA1 is designed to be secure for the following case.
You compute each SHA1 of many strings,for example 1 million, where each string is a concatenation of X+Y ,
where X is secret ...
