Which of the following is NOT part of the Kerberos authentication protocol?
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A. B. C. D.D.
There is no such component within kerberos environment.Kerberos uses only symmetric encryption and does not make use of any public key component.
The other answers are incorrect because : Symmetric key cryptography is a part of Kerberos as the KDC holds all the users' and services' secret keys.
Authentication service (AS) : KDC (Key Distribution Center) provides an authentication service Principals : Key Distribution Center provides services to principals , which can be users , applications or network services.
References: Shon Harris , AIO v3 , Chapter - 4: Access Control , Pages : 152-155.
Kerberos is a widely used network authentication protocol designed to provide secure authentication and authorization for network resources. It uses a client-server model to provide authentication for users and services in a network environment.
The Kerberos authentication protocol is based on symmetric key cryptography, which means that the same key is used for encryption and decryption. This key is shared between the Kerberos server and the client, and it is used to secure all the messages exchanged during the authentication process.
The Kerberos protocol consists of three main components:
Authentication Service (AS): This is the first component of the Kerberos protocol. The AS is responsible for verifying the identity of the client and issuing a ticket-granting ticket (TGT) to the client. The TGT is used by the client to obtain service tickets for specific network resources.
Ticket-Granting Service (TGS): The TGS is responsible for issuing service tickets to clients. The service tickets contain information about the client, the requested service, and a session key that is used to encrypt and decrypt messages exchanged between the client and the service.
Principals: A principal is an entity that can be authenticated by the Kerberos protocol. It can be a user, a server, or any other network resource that requires authentication.
Based on this information, we can eliminate option D, "Public Key," as it is not part of the Kerberos authentication protocol. Kerberos uses symmetric key cryptography for encryption and decryption, so it does not use public key cryptography.
Therefore, the correct answer is D. Public Key.