Secure Shell, is a tunnel encryption using port 22. It is commonly used as a secure alternative to telnet. SSH can also be used to encrypt just about any plain-text protocol, for example FTP over SSH. Secure Socket Layer (SSL) and Transport Security Layer (TLS) are very similar to SSH but are most commonly used in HTTPS. Blowfish is an older, but still common symmetric-key block cipher.
The Secure Shell Protocol (SSH) is a cryptographic network protocol for operating network services securely over an unsecured network Typical applications include remote command-line, login, and remote command execution, but any network service can be secured with SSH SSH provides a secure channel over an unsecured network by using a client–server architecture, connecting an SSH client application with an SSH server The protocol specification distinguishes between two major versions, referred to as SSH-1 and SSH-2 The standard TCP port for SSH is 22 SSH is generally used to access Unix-like operating systems, but it can also be used on Microsoft Windows