OpenSSH

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OpenSSH is a popular suite of software utilities implementing Secure Shell (SSH) protocol. OpenSSH includes the ability to set up a TCP secured channel and it is widely use as a replacement for not secured telnet and secure replacement of file transfers such as rcp and ftp.

The OpenSSH suite includes the following command-line utilities and daemons:

  • ssh, TCP secure replacement for rlogin, rsh and telnet to allow shell access to a remote machine.
  • scp, a replacement for rcp
  • sftp, a replacement for ftp to copy files between computers
  • sshd, the SSH server daemon which allows shell access and file transfers to a remote machine.
  • ssh-keygen, a tool to inspect and generate the RSA, DSA and Elliptic Curve keys that are used for user and host authentication
  • ssh-agent and ssh-add, utilities to ease authentication by holding keys ready and avoid the need to enter passphrases every time they are used
  • ssh-keyscan, which scans a list of hosts and collects their public keys

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