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The CTR mode with encrypted nonces and its extension to AE
Authors: Sergey AgievichAbstract:
In the modified CTR (CounTeR) mode known as CTR2, nonces are encrypted before constructing sequences of counters from them. This way we have only probabilistic guarantees for non-overlapping of the sequences. We show that these guarantees, and therefore the security guarantees of CTR2, are strong enough in two standard scenarios: random nonces and non-repeating nonces. We also show how to extend CTR2 to an authenticated encryption mode which we call CHE (Counter-Hash-Encrypt). To extend, we use one invocation of polynomial hashing and one additional block encryption.
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