For more information about Telnet, SSH, and libssh, please refer to the following:

• The SSH library https://www.libssh.org
• RFC 15: Network Subsystem for Time Sharing Hosts (Telnet) (https://tools.ietf.org/html/rfc15)
• RFC 855: Telnet Option Specifications (https://tools.ietf.org/html/rfc855)
• RFC 4250: The Secure Shell (SSH) Protocol Assigned Numbers (https://tools.ietf.org/html/rfc4250)
• RFC 4251: The Secure Shell (SSH) Protocol Architecture (https://tools.ietf.org/html/rfc4251)
• RFC 4252: The Secure Shell (SSH) Authentication Protocol (https://tools.ietf.org/html/rfc4252)
• RFC 4253: The Secure Shell (SSH) Transport Layer Protocol (https://tools.ietf.org/html/rfc4253)
• RFC 4254: The Secure Shell (SSH) Connection Protocol (https://tools.ietf.org/html/rfc4254)
• RFC 4255: Using DNS to Securely Publish Secure Shell (SSH) Key Fingerprints (https://tools.ietf.org/html/rfc4255)
• RFC 4256: Generic Message Exchange Authentication for the Secure Shell Protocol (SSH) (https://tools.ietf.org/html/rfc4256)