What are the 3 main parts of Kerberos?

Kerberos is a network authentication protocol that provides secure authentication for client/server applications by using secret-key cryptography. The Kerberos protocol is composed of three main parts:

1. Authentication Server (AS): The AS is responsible for initial authentication of a user. When a user wants to access a network resource, they send a request to the AS for a ticket-granting ticket (TGT). The AS verifies the user’s identity and creates a TGT, which contains the user’s identity and a secret key that can be used to authenticate the user to other servers in the network.
2. Ticket-Granting Server (TGS): The TGS is responsible for issuing service tickets to users. When a user wants to access a specific network resource, they send a request to the TGS for a service ticket. The TGS verifies the user’s identity by checking the TGT, and then creates a service ticket that contains the user’s identity and a session key that can be used to encrypt and decrypt messages between the user and the server hosting the resource.
3. Client: The client is the user or application that wants to access a network resource. The client sends requests to the AS and TGS to obtain the necessary tickets to access resources in the network. Once the client has obtained the necessary tickets, it can use them to authenticate itself to servers in the network and access the resources it needs.

These three parts work together in a series of exchanges to provide secure authentication and authorization for users and applications in a network environment. By using secret-key cryptography and a trusted third-party (the Kerberos server), the Kerberos protocol provides a high level of security and protection against network attacks such as eavesdropping, tampering, and replay attacks.

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