Security in large Mediator Protocols

Security in large Mediator Protocols

ABSTRACT

The combination of 3AQKDP (implicit) and 3AQKDPMA (explicit) quantum cryptography is used to provide authenticated secure communication between sender and receiver.In quantum cryptography, quantum key distribution protocols (QKDPs) employ quantum mechanisms to distribute session keys and public discussions to check for eavesdroppers and verify the correctness of a session key. However, public discussions require additional communication rounds between a sender and receiver. The advantage of quantum cryptography easily resists replay and passive attacks.

A 3AQKDP with implicit user authentication, which ensures that confidentiality is only possible for legitimate users and mutual authentication is achieved only after secure communication using the session key start.In implicit quantum key distribution protocol(3AQKDP) have two phases such as setup phase and distribution phase to provide three party authentication with secure session key distribution.  In this system there is no mutual understanding between sender and receiver. Both sender and receiver should communicate over trusted center.In explicit quantum key distribution protocol (3AQKDPMA) have two phases such as setup phase and distribution phase to provide three party authentications with secure session key distribution.  I have mutual understanding between sender and receiver. Both sender and receiver should communicate directly with authentication of trusted center. Disadvantage of separate process 3AQKDP and 3AQKDPMA were provide the authentication only for message, to identify the security threads in the message. Not identify the security threads in the session key. Security in large Mediator Protocols

EXISTING SYSTEM:

• In classical cryptography, three-party key distribution protocols utilize challenge response mechanisms or timestamps to prevent replay attacks .
• However, challenge response mechanisms require at least two communication rounds between the TC and participants, and the timestamp approach needs the assumption of clock synchronization which is not practical in distributed systems (due to the unpredictable nature of network delays and potential hostile attacks) .
• Furthermore, classical cryptography cannot detect the existence of passive attacks such as eavesdropping. This fact can then be used to reduce the number of rounds of other protocols based on challenge-response mechanisms to a trusted center (and not only three-party authenticated key distribution protocols).

PROPOSED SYSTEM:

In quantum cryptography, quantum key distribution  protocols (QKDPs) employ quantum mechanisms to distribute session keys and public discussions to check for eavesdroppers and verify the correctness of a session key. However, public discussions require additional communication rounds between a sender and receiver and cost precious qubits. By contrast, classical cryptography provides convenient techniques that enable efficient key verification and user authentication.