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In Kerberos, reliability is primarily addressed through the use of timestamps and expiration times for tickets, which help prevent replay attacks and ensure that authentication is based on current, valid credentials. Additionally, Kerberos employs symmetric key cryptography to secure communication between clients and servers, ensuring data integrity and confidentiality. The protocol also includes mechanisms for ticket renewal and revocation, allowing users to maintain their authenticated sessions without compromising security. Overall, these features help ensure that only valid and timely authentication requests are accepted.

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