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Other advantages of CTR are: easier to decrypt from a certain offset within the ciphertext no randomness requirements for the nonce nonce can be calculated, e.g. be a simple counter nonce can be a message identifier $E = D$: encryption is the same as decryption, which means only encryption or decryption required from the block cipher less logic ...


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There seems to be an attack on SSH when using CBC: Plaintext Recovery Attacks Against SSH. I have just scanned the paper and they state, that this will not be possible when CTR mode is used. I don't think that en-/decryption parallelization is need or even utilized in SSH. Update: Link to CERT concerning the topic: Vulnerability Note VU#958563 SSH CBC ...



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