What port does SAML use for security assertions?

SAML (Security Assertion Markup Language) uses TCP port 443 for security assertions. This is primarily due to the fact that SAML assertions are often sent over HTTP or HTTPS. TCP port 443 is the standard port for HTTPS, which provides a secure communication channel using SSL/TLS encryption. The use of this port ensures that SAML assertions, which contain sensitive authentication and authorization information, are transmitted securely over the internet.

The other ports mentioned in the options are associated with different protocols. For example, TCP port 88 is typically used for Kerberos authentication, which is not directly related to SAML. UDP port 123 is used by the Network Time Protocol (NTP), and TCP port 636 is used for LDAP over SSL (LDAPS). While these are important in their own contexts, they do not pertain to the transmission of SAML security assertions. Thus, the choice of TCP port 443 is directly relevant to the security and proper functioning of SAML.