All Questions
4
questions
1
vote
0
answers
215
views
Is ChaCha20 + HMAC(SHA3) output indistinguishable from randomness?
I was wondering, if the output of following type of ChaCha + HMAC scheme is indistinguishable from randomness:
...
2
votes
0
answers
165
views
How are ChaCha-based ARC4Random CSPRNGs initialized and reseeded?
I'm doing a spare-time project to collect cryptographic algorithms, implement them, and lastly benchmark them.
For the CSPRNG part, I'm evaluating NIST-SP-800-90Ar1 HMAC-DRBG and CTR-DRBG (Hash-DRBG ...
- 9,499
1
vote
1
answer
488
views
Is it okay to reuse a single symmetric key for a large volume of messages and HMACs, so long as "nonces" are randomly generated for both of them?
https://www.reddit.com/r/crypto/comments/fnku50/nonce_reuse_vs_iv_reuse/
Nonce reuse with the same key is catastrophic to security. The same premise holds for
initialization vectors. If the key ...
- 69
0
votes
1
answer
181
views
Termonology help: What is using AEAD without encrypting data called?
I'm using ChaCha20-Poly1305 in a "full AEAD" mode, where a payload of data is encrypted and a block of unencrypted "additional data" is secured as well.
However, I'd like to also occasionally use the ...
