Which protocol is typically used for secure communication in network services?

The use of SSH, or Secure Shell, is the standard protocol for secure communication in network services. It provides a secure channel over an unsecured network by encrypting the data that is transferred between the client and server. This ensures that sensitive information, such as passwords and data files, cannot be easily intercepted by unauthorized parties.

SSH is designed to replace older, less secure protocols, allowing for secure remote shell access, file transfer, and other types of network services. Its security features include strong encryption, secure authentication methods, and integrity assurance of the data exchanged, making it a critical component in contemporary network security architectures.

In contrast, the other protocols mentioned do not offer the same level of security. Telnet transmits data in plain text without encryption, making it vulnerable to eavesdropping. HTTP, while widely used for web traffic, also sends data in unencrypted form, subject to interception and manipulation. FTP transfers files unencrypted as well, which exposes any sensitive data during transmission. Consequently, SSH is the preferred choice for secure communications in network services.