# Other Authentication Protocols

- ## TACACS (TACACS+ and XTACACS)

  - Developed by Cisco Systems for Military applications. Originally used between Cisco terminal server and a UNIX TACACS server.
  - Mostly replaced by RADIUS since Cisco added RADIUS support to access products
  - Still used for SecurID lookups since SecurID (ACE) server support TACACS. However, new releases of SecurID now support RADIUS.

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