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  • The random padding in SSH to which I'm referring is random padding that brings the plaintext payload up to a multiple of the cipher block size. I'm wondering why the padding is recommended to be random, as opposed to non-random. If it is encrypted, why does it matter? Padding to combat timing analysis is another issue, I believe. SSH provides SSH_MSG_IGNORE (RFC 4253 Section 11.2) for this purpose. Commented May 8, 2017 at 22:39
  • Ah, not random length padding but random bits in the used padding. Commented May 8, 2017 at 23:18