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The Central Authentication Service (CAS) is a single sign-on protocol for the web. [1] Its purpose is to permit a user to access multiple applications while providing their credentials (such as user ID and password) only once.
CAS / Central Authentication Service: Apereo: Free & Open Source Protocol and open-source SSO server/client implementation with support for CAS, SAML1, SAML2, OAuth2 ...
The service provider, wishing to know the identity of the user, issues an authentication request to a SAML identity provider through the user agent. The identity provider is the one that provides the user credentials. The service provider trusts the user information from the identity provider to provide access to its services or resources.
The Generic Security Service Application Program Interface (GSSAPI, also GSS-API) is an application programming interface for programs to access security services. The GSSAPI is an IETF standard that addresses the problem of many similar but incompatible security services in use as of 2005 [update] .
Central Authentication Server (CAS) [15] Apereo Foundation: Open source SAML 2.0, OAuth2, OpenID, WS-Federation Centrify DirectControl: Centrify: Commercial SAML, OpenID, OAuth, WS-*, LDAP, Kerberos Ceptor [16] Ceptor: Commercial SAML 1.1/2.0, OAuth 2.0, WS-Federation, OpenID Connect, Kerberos cidaas [17] cidaas by Widas ID GmbH Commercial
The service is authorized by law in 6 USC 1523: Federal cybersecurity requirements part (b) (1) (D): [6] "implement a single sign-on trusted identity platform for individuals accessing each public website of the agency that requires user authentication, as developed by the Administrator of General Services in collaboration with the Secretary" [7]
Authentication and authorization infrastructure solutions address such limitations. With an AAI, access control is not managed by a central register, but by the respective organization of the user who wishes to access a specific resource.
The CAC is issued to active United States Armed Forces (Regular, Reserves and National Guard) in the Department of Defense and the U.S. Coast Guard; DoD civilians; USCG civilians; non-DoD/other government employees and State Employees of the National Guard; and eligible DoD and USCG contractors who need access to DoD or USCG facilities and/or DoD computer network systems: