Gatak wrote:

Thanks for the link. I have in fact already emailed the PuTTY authors, though they have not replied. I would say PuTTY is an almost dead, if not stale, project since the only update since over two years back is a security fix in August last year.

I'm sure they will consider your request.

Thanks for the link. I have in fact already emailed the PuTTY authors, though they have not replied. I would say PuTTY is an almost dead, if not stale, project since the only update since over two years back is a security fix in August last year.

Please request support for these at PuTTY project.
https://www.chiark.greenend.org.uk/~sgtatham/putty/
We will take over their implementation.

I think you already support GCM mode, but I'll add it too: aes256-gcm@openssh.com

Would it be possible to add some new cipher suites introduces in openssh and libssh?

curve25519-sha256@libssh.org (important)
hmac-sha2-512-etm@openssh.com (ETM - Encrypt the Mac)
hmac-sha2-256-etm@openssh.com (ETM - Encrypt the Mac
umac-128-etm@openssh.com (umac is faster than hmac's)