Re: [TLS] [Cfrg] Collision issue in ciphertexts.

2015-11-02 Thread Dang, Quynh
Now, you talked about a MAC function (with AES). I previously talked about encryption. If I , the only person, uses the MAC key, when I generate more than 2^64 MAC values (Let's say each MAC value is 96 bits), I have many collided MAC pairs. But, I am the only one (beside the person(s) verifyi

Re: [TLS] [Cfrg] Collision issue in ciphertexts.

2015-11-02 Thread Watson Ladd
On Nov 2, 2015 2:14 AM, "Dang, Quynh" wrote: > > Hi Eric, > > > As you asked the question about how many ciphertext blocks should be safe under a single key, I think it is safe to have 2^96 blocks under a given key if the IV (counter) is 96 bits. This is wrong for PRP, right for PRF. It's not tha