All Questions
4
questions
0
votes
1
answer
307
views
XChaCha20 With a Zeroed Nonce?
We know that for ChaCha20 and XChaCha20, the same key can never be used with the same nonce. But let's say I use a random 256-bit key every time... Then the nonce can be whatever because the key is ...
- 449
2
votes
2
answers
410
views
Can I use ChaCha20-Poly1305 as my KDF?
I have two devices that use a PSK. One is embedded and extremely resource confined. I'm already using ChaCha20-Poly1305 so it would be "free" to reuse this. There is no transport encryption ...
2
votes
1
answer
1k
views
Is it safe to reuse the same nonce for decryption an indefinite amount of times in this context?
I'm creating a password management application and I'm considering using the following procedure to keep passwords safe:
Asking the user for raw_password, for ...
- 427
2
votes
1
answer
607
views
ChaCha20-Poly1305: Can my salt/pass for a KDF also be the nonce?
I have a PSK. I don't want to use it directly. I want to pass a "salt"/password into a KDF and get a new key for authenticated encryption with ChaCha20-Poly1305 .
I need to give the other side the ...