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Results tagged with hmac
Search options questions only
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user 1141
HMAC is a method for constructing a message authentication code based on a cryptographic hash function.
7
votes
1
answer
717
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Memory-hard operations in work-factor hash functions
I'm playing around with work-factor hash functions, and I'm looking for a memory-hard operation to make it resistant to GPU / parallel hardware attacks. I considered a very large (i.e. 64K) s-box that …
- 3,567
1
vote
2
answers
2k
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Is it worth applying a MAC on data in a HSM?
Is it worth applying a HMAC-SHA1 hash over this data to provide integrity and authenticity checking? If so, what should I use as key material? …
- 3,567
14
votes
2
answers
11k
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Is PBKDF2-HMAC-SHA1 really broken?
I just read through this article which demonstrates practical (and seemingly trivial) collisions in PBKDF2-HMAC-SHA1, and provides a few examples of collisions.
Am I missing something here? … Is PBKDF2-HMAC-SHA1 really broken this badly and trivially? Or am I missing some wider context? …
- 3,567
9
votes
2
answers
1k
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Would a HMAC digest make sense in an RSA / ECDSA signature?
However, in each case, the HMAC variant of each hash function was not affected. In fact, unless I missed something, HMAC-MD5 is technically still secure. … Something like this: $s = k \mathbin\Vert S(k \mathbin\Vert H(m,k))$ where $S$ is some asymmetric signing operation such as RSA or ECDSA, $k$ is a randomly generated key, $H$ is HMAC-SHA256. …
- 3,567