Entropic security in Quantum Cryptography

Details Entropic security in Quantum Cryptography Entropic security in Quantum Cryptography

2007-03-06

arxiv.org/abs/quant-ph/0703046v2

Physics

Quantum Physics

12 pages

Scientific paper

We present two new definitions of security for quantum ciphers which are inspired by the definition of entropic security and entropic indistinguishability defined by Dodis and Smith. We prove the equivalence of these two new definitions. We also propose a generalization of a cipher described by Dodis and Smith and show that it can actually encrypt n qubits using less than n bits of key under reasonable conditions and yet be secure in an information theoretic setting. This cipher also totally closes the gap between the key requirement of quantum ciphers and classical ciphers.

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