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. When there is a collision between two ciphertext blocks when two different counter values are used , the chance of the same plaintext was used twice is 1^128. Collisions start to happen a lot when the number of ciphertext blocks are above 2^64. However, each collision just reveals that the corresponding plaintext blocks are probably different ones. Quynh.
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