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MMLU-Pro / 10671 / MIT’s Kerberos KDC server has a maximum ticket lifetime of 24 hours (for most…

Problem

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question

MIT’s Kerberos KDC server has a maximum ticket lifetime of 24 hours (for most user principals). What ensures that an expired Kerberos ticket can no longer be used?

category

computer science

options

  1. When a client connects to a server, the server compares the ticket’s expiration time to the server’s current clock, and refuses to authenticate the user if the ticket expiration time is in the past.
  2. The server maintains a database of all active and expired tickets, and refuses to authenticate the user if the ticket is found in the expired list.
  3. When a client connects to a server, the server sets a 24-hour timer to terminate the connection, which ensures a client cannot remain connected past the ticket’s maximum lifetime.
  4. The client's system automatically disconnects from the server once the ticket lifetime is over.
  5. The client needs to manually disconnect from the server after the ticket's maximum lifetime is reached.
  6. The Kerberos server (KDC) refuses to establish new connections between clients and servers for expired tickets.
  7. The Kerberos server (KDC) sends an alert to the client and server to terminate the connection once the ticket is expired.

src

ori_mmlu-computer_security

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