Kerberos
Basically, Kerberos comes down to just this:
a protocol for authentication
uses tickets to authenticate
avoids storing passwords locally or sending them over the internet
involves a trusted 3rd-party (KDC)
built on symmetric-key cryptography
Pictorially:
Terms:
AS-REQ: Authentication Service Request
AS-REP: Authentication Service Response
TGS-REQ: Ticket Granting Service Request
TGS-REP: Ticket Granting Service Response
Reference
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