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.
- 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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- Convert a putty ssh key format to Openssh format, you can follow the following instructions http://www.codeblocq.com/2016/05/Convert-a-putty-ppk-key-to-a-pem-file-on-OSX/, https://stackoverflow.com/questions/3475069/use-ppk-file-in-mac-terminal-to-connect-to-remote-connection-over-ssh
- Open a reverse ssh tunnel, follow the following instructions https://www.howtoforge.com/reverse-ssh-tunneling