Kerberos prevents 'replay attacks' by using Time-stamped tickets. Here's how it works:

1. When a client requests access to a service, the Key Distribution Center (KDC) issues a ticket to the client. This ticket contains a timestamp.

2. The timestamp indicates the time at which the ticket was issued.

3. When the client presents this ticket to the service, the service checks the timestamp to ensure that the ticket is not old or replayed.

4. If the ticket is too old (beyond the acceptable time skew), the service rejects the ticket to prevent a replay attack.

5. This way, even if an attacker manages to steal a ticket, they cannot use it after the time skew as the service will reject it.

So, the mechanism Kerberos employs to prevent 'replay attacks' is Time-stamped tickets.

Question

Kerberos prevents 'replay attacks' by using Time-stamped tickets. Here's how it works:

1. When a client requests access to a service, the Key Distribution Center (KDC) issues a ticket to the client. This ticket contains a timestamp.

2. The timestamp indicates the time at which the ticket was issued.

3. When the client presents this ticket to the service, the service checks the timestamp to ensure that the ticket is not old or replayed.

4. If the ticket is too old (beyond the acceptable time skew), the service rejects the ticket to prevent a replay attack.

5. This way, even if an attacker manages to steal a ticket, they cannot use it after the time skew as the service will reject it.

So, the mechanism Kerberos employs to prevent 'replay attacks' is Time-stamped tickets.

Knowee AI · Accepted Answer

Kerberos prevents 'replay attacks' by using Time-stamped tickets. Here's how it works:

1. When a client requests access to a service, the Key Distribution Center (KDC) issues a ticket to the client. This ticket contains a timestamp.

2. The timestamp indicates the time at which the ticket was issued.

3. When the client presents this ticket to the service, the service checks the timestamp to ensure that the ticket is not old or replayed.

4. If the ticket is too old (beyond the acceptable time skew), the service rejects the ticket to prevent a replay attack.

5. This way, even if an attacker manages to steal a ticket, they cannot use it after the time skew as the service will reject it.

So, the mechanism Kerberos employs to prevent 'replay attacks' is Time-stamped tickets.

What mechanism does Kerberos employ to prevent 'replay attacks'?Public-key encryptionTime-stamped ticketsCertificate-based authenticationContinuous key exchange