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Results tagged with hmac
Search options questions only
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user 4640
HMAC is a method for constructing a message authentication code based on a cryptographic hash function.
33
votes
2
answers
25k
views
Is HMAC-MD5 considered secure for authenticating encrypted data?
I've read something to the effect that the HMAC construct is able to lessen the problem of collisions in the underlying hash. … Does that mean that something like HMAC-MD5 still might be considered safe for authenticating encrypted data? …
- 803
0
votes
2
answers
1k
views
Recommended authenticated stream cipher for minimum overhead?
I'm running my TCP/IP protocol secured by encrypting each packet with AES128/CBC, bundling a SHA256 HMAC over that packet. … This causes quite a bit of space overhead for small packets, so at first I was thinking of running AES in CTR-mode and still use the HMAC, but it would be much better to run some sort of stream cipher …
- 803
3
votes
1
answer
538
views
Is this an acceptable authenticated encryption?
Calculate HMAC-SHA256(signing key, 4 byte message number || 4 byte message length || ciphertext)
Increase message number by 1. … Send ciphertext || first 8 bytes of HMAC
On decryption, checking HMAC is made so that successful matching the HMAC and failing to match the HMAC should execute equally fast. …
- 803