1. Changes since OpenSSH 4.1 include security bug fixes relating to GatewayPorts, and GSSAPI,
which eliminates the risk of credentials being inadvertently exposed to an untrusted user/host.

2. OpenSSH is a 100% complete SSH protocol version 1.3, 1.5 and 2.0 implementation.

3. It includes sftp client and server support.

4. New compression method, proactive changes for signed vs. unsigned integer bugs, and many
additional bugfixes and improvements.