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Question:

What is the oldest authentication encryption protocol that Cisco developed but became an open protocol in the 1990s and is available on Linux distributions?

A TACACS+.
explanation

Cisco developed the authentication protocol TACACS+, which is currently an open standard. Released in 1993, it separates and encrypts the AAA (authentication, authorization, and accounting) packets. RADIUS (Remote Authentication Dial-In User Service), an authentication protocol, was introduced in 1997. Since the 1980s, the open source authentication protocol Kerberos has been in use. The successor to TKIP (Temporal Key Integrity Protocol), AES (Advanced Encryption Standard) has been available since 2001 and is used for wireless encryption rather than authentication.

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