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Methods and death penalty of quantum cryptography Dheera Venkatraman MIT Department of Physics dheera@mit.edu 27 April 2004 Abstract Quantum machinelike properties of communication lines may be ladder to new possibilities in the security of key dispersion. By taking advantage of staple fibre quantum mechanical principles, it may be potential to create touch on systems that rely upon the natural philosophy of the system rather than computational or mathematical methods for security. In this paper, three possible protocols for quantum key distribution are described. 1 Introduction In the electronic communication networks that facilitate the much(prenominal) of the spheres development exchange, privacy and security earn everlastingly remained important issues to be addressed. Since the very ?rst military applications of electronic communication, encoding algorithms have been developed to keep such information pay off between a given(p) transmitter and m urderer. However, some(prenominal) of these algorithms are computationally acuate and rely upon the assumption that eavesdroppers do not have su?ciently fasting technology or mathematics to break the scheme. The principles of quantum mechanics, however, may o?er alternative methods to encryption which may circumvent legion(predicate) of these issues, several of which, along with possible implementations, will be discussed.

2 1.1 Classical cryptography and the key distribution problem employ classical communication methods, cryptography has been computationally implement in a number of ways. One of the simplest such methods involves mathematically transforming a messa! ge M , by a given word or key K [1]. In the simplest implementation unmatchable could simply add M and K; provided K is at least as large as M , it is unaffixed to see that this system is, in fact, perfectly secure. For causa, ensure an example of the simple Vernam cipher: Suppose a sender Alice (named by convention) wishes to transmit a message M = 51242 to a receiver Bob. They could agree to use a key...If you want to amount a full essay, order it on our website: BestEssayCheap.com

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