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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 ...
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1k views

In the SHA hash algorithm, why is the message always padded?

In the SHA hash algorithm the message is always padded, even if initially the correct length without padding; the padding is of the form "1" followed by the necessary number of 0s. Why is it ...