3
votes
1answer
50 views

Does displaying HMAC hashes of user inputs compromise the HMAC validation?

Here is the scenario: "SECRET" is a secret key that is kept private and only used in this one application. The application allows users to enter in any "VALUE" (within various open-ended limits such ...
1
vote
1answer
104 views

HMAC-SHA1 vs HMAC-SHA256

I have three questions: Would you use HMAC-SHA1 or HMAC-SHA256 for message authentication? How much HMAC-SHA256 is slower than HMAC-SHA1? Are the security improvements of SHA256 (over SHA1) enough ...
2
votes
1answer
285 views

HMAC-SHA1 input size

I know that the HMAC is a message authentication code that uses a cryptographic key in conjunction with a hash function (SHA1 , MD5, etc.). The HMAC output is 160 bits for HMAC-SHA160 and 256 bits for ...