As the quantum cryptography is the ultimate solution for information security. Quantum cryptography describes the ultimate way for key distribution. Unlike many of the classical cryptosystems in use today, whose security often draws on unproven assumptions about the computational complexity of mathematical problems, the security of quantum cryptography is based on the laws of physics. The Quantum Key Distribution follows some protocols for key distribution.In this paper we describe the BB84 protocol which is used in QuantumCryptography and the security aspect of entanglement based version ofBB84.

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Is the newly born quantum cryptography the ultimate solution for information security? A technique needs to be both theoretically strong and practically viable. But quantum cryptography comes to naught in the latter. Unlike many of the classical cryptosystems in use today, whose security often draws on unproven assumptions about the computational complexity of mathematical problems, the security of quantum cryptography is based on-and employs-the laws of physics. The term -unconditional security‖is used to emphasize the fact that it does not rely on the presumed, yet unproven hardness of somemathematical problem. In this Paper, we present the proof of the unconditional security of the BB84 protocol, as devised by Peter Shor and John Preskill [1]. Category and Subject DescriptorQuantum Computing. General TermsQuantum Cryptography, BB84 Protocol. KeywordsQubit, Quntum Key Distribution, Security. 1.INTRODUCTIONQuantum cryptography uses quantum mechanics to guarantee secure communication. It enables two parties to produce a shared random bit string known only to them, which can be used as a key to encrypt and decrypt messages. An important and unique property of quantum cryptography is the ability of the two communicating users to detect the presence of any third party trying to gain knowledge of the key. This results from a fundamental part of quantum mechanics: the process of measuring a quantum system in general disturbs the system. A third party trying to eavesdrop on the key must in some way measure it, thus introducing detectable anomalies. By using quantum superpositions or quantum entanglement and transmitting information in quantum states, a communication system can be implemented which detects eavesdropping. If the level of eavesdropping is below a certain threshold a key can be produced which is guaranteed as secure, otherwise no secure key is possible and communication is aborted.The security of quantum cryptography relies on the foundations of quantum mechanics, in contrast to traditional public key cryptography which relies on the computational difficulty of certain mathematical functions, and cannot provide any indication of eavesdropping or guarantee of key security. Quantum cryptography is only used to produce and distribute a key, not to transmit any message data. This key can then be used with any chosen encryption algorithm to encrypt and decrypt a message, which can then be transmitted over a standard communication channel. The algorithm most commonly associated with QKD is the one-time pad, as it is provably secure when used with a secret, random key. QUANTUM CRYPTOGRAPHYRather than depending on the complexity of factoring large numbers, quantum cryptography is based on the fundamental and unchanging principles of quantum mechanics. In fact, quantum cryptography rests on two pillars of 20th century quantum mechanics -the Heisenberg Uncertainty principle and the principle of photon polarization. According the Heisenberg Uncertainty principle, it is not possible to measure the quantum sta...

Traditional methods of security accreditation in the Government classified arena are outdated. They are becoming increasingly ineffective in maintaining security, irrelevant and damaging to the effectiveness and efficiency of IT systems and the organizations they serve. It is important to move towards a genuine risk-management approach to IT security. This will release resources to concentrate on the important tasks of monitoring and auditing IT security of systems and distributed networks in operation. This memorandum describes management framework also for the non uniform distributed network. In this paper we are giving an approach for information security in a Client/Server based Distributed network. With this work we address several factors concerning security and auditing of information in distributed network environments.