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Security Dictionary
Can't tell 'smtp' from 'snmp'? Find the precise meaning of these and hundreds of other security-related terms in our convenient and up-to-date Security Dictionary.
Terminal Access Controller (TAC) Access Control System (TACACS)
(I) A UDP-based authentication and access control protocol [R1492]
in which a network access server receives an identifier and
password from a remote terminal and passes them to a separate
authentication server for verification.
(C) TACACS was developed for ARPANET and has evolved for use in
commercial equipment. TACs were a type of network access server
computer used to connect terminals to the early Internet, usually
using dial-up modem connections. TACACS used centralized
authentication servers and served not only network access servers
like TACs but also routers and other networked computing devices.
TACs are no longer in use, but TACACS+ is. [R1983]
- "XTACACS": The name of Cisco Corporation's implementation,
which enhances and extends the original TACACS.
- "TACACS+": A TCP-based protocol that improves on TACACS and
XTACACS by separating the functions of authentication,
authorization, and accounting and by encrypting all traffic
between the network access server and authentication server. It
is extensible to allow any authentication mechanism to be used
with TACACS+ clients.
