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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 ...
0
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0answers
70 views
Why do we always append padding bits in SHA-512? [duplicate]
Possible Duplicate:
In the SHA hash algorithm, why is the message always padded?
I'm reading the book Network Security Essentials written by William Stallings.
To create a message digest ...
2
votes
3answers
425 views
Hash function in PBKDF2
From this excellent answer I learned (correct me if I am wrong) that when writing a block cipher with say key size 128 bit, one has to pad the password given (variable size) so that it becomes exactly ...
5
votes
3answers
934 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 ...
9
votes
3answers
546 views
Why does the padding in MD5 contain the message length?
I understand the need for padding in MD5. But why do we append the message length to the padding?
I heard it strengthens the hash but how?
Please provide an example if possible and how it applies to ...
