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SecureCRT supports two versions of the Secure Shell protocol. What's the difference between SSH1 and SSH2?

SSH2 is the current version of the Secure Shell protocol, with a draft under consideration by a working group of the Internet Engineering Task Force (IETF) - the first step in the IETF standards process. SSH1 is the first version of the Secure Shell protocol, dating from 1995. SSH1 was developed through 1998, when the technical focus on security issues and optimization shifted to SSH2. The SSH2 protocol was a complete reconception of the protocol and is intended to remove limitations in SSH1, such as the absence of message authentication codes (MACs). The SSH1 draft documentation is not part of the IETF process, and does not match the current SSH1 server implementations. SSH1 has a significant installed base, particularly among early adopters of Secure Shell, and has a more open server licensing for some organizations. However, the maturity and improved security of SSH2 make it VanDyke's preferred protocol.