All Questions
Tagged with chacha initialization-vector
5
questions
1
vote
1
answer
502
views
XChaCha20-Poly1305 question about IV's
I've a question about XChaCha20-Poly1305, from a brute force perspective. Suppose we have the power to brute force crack it. If the IV is known to the attacker and it's only one file. The time needed ...
- 13
6
votes
1
answer
1k
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Would it be safe to use the message hash as the IV in ChaCha?
This seemed like an option if the hash is unpredictable.
It could be the hash of the message or the hash of the message + some common secret (apart from the key).
The only circumstance in which the ...
- 135
0
votes
1
answer
526
views
Sending the nonce in ChachaPoly1305 with the ciphertext
I am trying to implement a ChachaPoly1305 encryption with authentication scheme over a network. I am using a counter to derive the nonce as suggested by the rfc.
Is it secure to send the nonce over ...
- 277
3
votes
1
answer
485
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Using ChaCha20 on very short messages with high packet loss
I'm building a low power wireless network and need to transmit very small packets at regular intervals (10 bytes every minute or so). In order to secure the communications I'm considering using ...
- 33
4
votes
1
answer
142
views
Symmetric encryption algorithms with large IVs and authentication?
Most modern symmetric ciphers require a nonce/IV. If the nonce is reused, security is lost.
If the nonce is large enough, it can be generated securely by using a CSPRNG. This avoids needing to keep ...
- 4,793