OpenSSH needs no introduction. OpenSSH is a free and open source suite of security-related software based on the SSH protocol. OpenSSH provides secure network communication and tunneling capabilities. OpenSSH gives peace of mind when communicating with Linux or Unix-like server over the Internet on the insecure network.
SSH is essential for both sysadmins and developers. The book "SSH Mastery" (2nd ed) talks about OpenSSH server, clients, encryption, public/private keys, VPNs and other security-related network-level utilities based on the Secure Shell SSH protocol.
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