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Simon Tatham

PuTTY is an SSH and telnet client, developed originally by Simon Tatham for the Windows platform. PuTTY is open source software that is available with source code and is developed and supported by a group of volunteers.

Does PuTTY support SSH-2?

Yes. SSH-2 support has been available in PuTTY since version 0.50 in 2000. Public key authentication (both RSA and DSA) in SSH-2 was new in version 0.52 in 2002

Does PuTTY support reading OpenSSH or SSH-2 private key files?

PuTTY doesn't support this natively (see the wishlist entry for reasons why not), but as of 0.53 PuTTYgen can convert both OpenSSH and private key files into PuTTY's format.

Does PuTTY support SSH-1?

Yes. SSH-1 support has always been available in PuTTY. However, the SSH-1 protocol has many weaknesses and is no longer considered secure; you should use SSH-2 instead if at all possible. As of 0.68, PuTTY will no longer fall back to SSH-1 if the server doesn't appear to support SSH-2; you must explicitly ask for SSH-1

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