Which of the following is not a common transport encryption protocol?

The choice of SAML (Security Assertion Markup Language) as the option that is not a common transport encryption protocol is accurate because SAML serves a different purpose within the realm of security. It is primarily an XML-based framework used for exchanging authentication and authorization data between parties, specifically between an identity provider and a service provider. SAML is focused on facilitating single sign-on (SSO) capabilities, enabling users to authenticate once and gain access to multiple applications without needing to log in repeatedly.

In contrast, the other options are indeed transport encryption protocols. SSL (Secure Sockets Layer) and TLS (Transport Layer Security) are widely recognized protocols designed to provide secure communication over a computer network, ensuring the confidentiality and integrity of data in transit. IPsec (Internet Protocol Security), on the other hand, is a suite of protocols that secures Internet Protocol (IP) communications by authenticating and encrypting each IP packet of a communication session. These protocols focus on encrypting the data being transmitted to protect it from eavesdropping and tampering.

Understanding the distinction between these options highlights the specific roles they play in the security landscape, with SAML focusing on authentication and authorization rather than transport encryption.