Which of the following protocols provides transport security for virtual terminal emulation?
Correct Answer: B
Secure Shell (SSH) is a tunneling protocol originally designed for Unix systems. It uses encryption to establish a secure connection between two systems. SSH also provides
alternative, security-equivalent programs for such Unix standards as Telnet, FTP, and many other communications-oriented applications. SSH is available for use on Windows
systems as well. This makes it the preferred method of security for Telnet and other cleartext oriented programs in the Unix environment.
A: TLS is used to provide a secure channel, not to establish a telnet connection.
The Secure Socket Layer (SSL) and Transport Layer Security (TLS) is the most widely deployed security protocol used today. It is essentially a protocol that provides a secure channel
between two machines operating over the Internet or an internal network.
C: Secure copy or SCP is a means of securely transferring computer files between a local host and a remote host or between two remote hosts. It is based on the Secure Shell (SSH)
protocol. SCP is not used to establish a telnet connection.
D: S/MIME is for e-mail and other electronic messaging applications, not for telnet connections.
S/MIME provides the following cryptographic security services for electronic messaging applications: authentication, message integrity, non-repudiation of origin (using digital
signatures), privacy and data security (using encryption).
Dulaney, Emmett and Chuck Eastton, CompTIA Security+ Study Guide, 6th Edition, Sybex, Indianapolis, 2014, pp. 75, 76, 91, 270, 271