PuTTY wish ssh2-rsa-kex

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RFC 4432 (formerly draft-harris-ssh-rsa-kex) defines a means to use RSA key exchange in SSH-2 (similar to SSH-1's key exchange, but without the other disadvantages of SSH-1). This might be particularly suitable for slow client systems.

SGT, 2012-06-22: Perhaps this is as good a place as any to keep a list of known server-side implementations.

• OpenSSH bug #1314 includes a patch which adds RSA key exchange to OpenSSH, although the OpenSSH maintainers decided not to integrate it in the end.
• MouSSH supports RSA key exchange. (It looks as if the FTP link here is the most convenient way to get MouSSH: you'll need the contents of that directory and several libraries in directories alongside it – see the INSTALL file for a list – and I haven't personally confirmed that it compiles and works.)
• The mod_sftp module for ProFTPD is documented as supporting RSA key exchange. (But it looks as if you can't do anything except SFTP over the resulting connection.)