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Results tagged with hmac
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user 25928
HMAC is a method for constructing a message authentication code based on a cryptographic hash function.
1
vote
1
answer
662
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How to key an HMAC with keys from separate mutually untrusted parties?
The problem is as follows:
There are two parties, both of whom would like to HMAC a message with a key. … The ideas I have are
HMAC(message, key1 || key2)
HMAC(HMAC(message, key1), key2)
HMAC(message, HMAC(key1, key2))
However, this is starting to feel like one of those problems where there is some subtle …
- 157
1
vote
0
answers
50
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HMAC for provable server distributed randomness
For example: Using an HMAC where the HMAC key is a server secret and the HMAC message is not a reliable secret at all (a username, for instance). …
- 157