Composability in quantum cryptography

Composability in quantum cryptography

If we combine two secure cryptographic systems, is the resulting system still secure? Answering this question is highly nontrivial and has recently sparked a considerable research effort, in particular, in the area of classical cryptography. A central insight was that the answer to the question is yes, but only within a well-specified composability framework and for carefully chosen security de...

A Paradox of Quantum Universal Composability

Security of cryptographic protocols under composition is a major concern in cryptography. For classical cryptography Canetti gave a definition of security implying universal composability [Can01]. A protocol proven secure in that sense may replace ideal functionalities in arbitrary applications preserving the overall security of the application. In this contribution we sketch the modifications ...

Quantum Cryptography

Quantum cryptography

This is a chapter on quantum cryptography for the book “A Multidisciplinary Introduction to Information Security” to be published by CRC Press in 2011/2012. The chapter aims to introduce the topic to undergraduate-level and continuing-education students specializing in information and communication technology.

Quantum Cryptography

Quantum Cryptography was born in the early seventies when Stephen Wiesner wrote “Conjugate Coding”, which unfortunately took more than ten years to see the light of print [50]. In the mean time, Charles H. Bennett (who knew of Wiesner’s idea) and Gilles Brassard picked up the subject and brought it to fruition in a series of papers that culminated with the demonstration of an experimental proto...