Explain the principles of Single Sign-On (SSO) mechanisms and their role in access management.

Single Sign-On (SSO) mechanisms allow a user to authenticate once and gain access to multiple related but separate systems without re-entering credentials.

The principle of SSO is based on centralized authentication. When a user logs into the first system, it authenticates them and creates a token or session confirming their identity. When accessing other systems, this token is passed and verified, avoiding the need to re-enter login and password.

The role of SSO in access management:

• Simplifies user work by reducing the number of passwords and logins.
• Enhances security, as authentication is centrally controlled and unified security policies can be applied.
• Eases administration by allowing centralized management of access rights and sessions.

Examples of protocols used in SSO include OAuth, SAML, and OpenID Connect.