OpenSSH 7.4 is here four and a half months after the release of OpenSSH 7.3, and it promises to be primarily a bugfix release that addresses many of the security issues discovered since OpenSSH 7.3. But first, it looks like this version includes various under-the-hood changes that may affect existing configurations. For example, it removes support for the the SSH version 1 protocol as SSH2 is a more secure, efficient, and portable version of SSH (Secure Shell), which delivers SSH-encrypted SFTP functionality. It also removes 3des-cbc from the client’s default proposal, as well as support for pre-authentication compression.
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