PuTTY wish encrypt-then-mac

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summary: Add support for OpenSSH encrypt-then-MAC scheme
class: wish: This is a request for an enhancement.
priority: medium: This should be fixed one day.
fixed-in: b0823fc5be15e429bac4619bf7e2e9f829c02eea 2015-04-27 (0.68)

OpenSSH has a mechanism for changing SSH-2 from its usual encode-then-encrypt-and-MAC scheme to a more conventional encrypt-then-MAC. This is signalled by new MAC algorithms with -etm in their names. Of these, PuTTY now supports:

hmac-sha2-256-etm@openssh.com
hmac-sha1-etm@openssh.com
hmac-sha1-96-etm@openssh.com
hmac-md5-etm@openssh.com

PuTTY doesn't currently prefer these because it's not clear to us that they give any security benefit except when using CBC-mode ciphers, and any server that supports ETM will also be able to do something better than CBC.

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Audit trail for this wish.

(last revision of this bug record was at 2015-06-25 23:43:58 +0100)

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