איזה משפט אינו נכון בהקשר של מנגנון Kerberos?

3. The server contains AS and TGS. Explanation: This statement is true. In the Kerberos architecture, there are two main components of the authentication server (AS) and the ticket granting server (TGS). The AS is responsible for authenticating users and issuing the initial Ticket Granting Ticket (TGT). The TGS issues service tickets based on the TGT to allow access to other services within the network. 4. The system relies on Symmetric Key. Explanation: This statement is true. Kerberos primarily uses symmetric key cryptography for authentication. Each user and service has a shared secret key known only to them and the Kerberos server. This symmetric key is used to encrypt and decrypt the tickets and messages exchanged, ensuring confidentiality and integrity. 5. The TGT (Ticket Granting Ticket) is used to obtain additional tickets for other applications. Explanation: This statement is true. The TGT is issued by the AS after the initial authentication. Once a client has the TGT, it can use it to request service tickets from the TGS for specific applications or services within the network without needing to re-authenticate. This allows for a seamless user experience while maintaining security.