Basic CS [TCS Placement]: Sample Questions 176 - 176 of 196

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Question 176

Basic CS
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Describe in Detail

Essay▾

What is Kerberos?

Explanation

  • Authentication service developed at the Massachusetts Institute of Technology using encryption to prevent intruders from discovering passwords and gaining unauthorized access to files.
    • Uses secret-key cryptography to authenticate client-server applications.
    • Encrypted ticket is requested from an authenticated server sequence to use services.
  • It is a ticket based system:
    • Authentication server uses Kerberos ticket to grant server access and then creates a session key based on the requester՚s password and another randomized value.
    • The ticket-granting ticket (TGT) is sent to the ticket-granting server (TGS) using the same authentication server.
  • Requester receives encrypted TGS key with a time stamp and the ticket. Key is returned to the requester and decrypted.
    • Requester sends the TGS this information and forwards the encrypted key to the server to obtain the desired service.
    • Server accepts the ticket and performs the desired user service.
  • Gets name from the three-headed dog (Kerberos, or Cerberus) guarding the gates of Hades (Greek mythology) .
  • Developed as part of Project Athena - a joint project between the Massachusetts Institute of Technology (MIT) , Digital Equipment Corporation, and IBM that ran between 1983 and 1991.
Given the Image is Define the Kerberos

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