By C. Kollmitzer (auth.), Christian Kollmitzer, Mario Pivk (eds.)

ISBN-10: 3642048293

ISBN-13: 9783642048296

Using the quantum homes of unmarried photons to replace binary keys among companions for next encryption of mystery info is a fully novel expertise. just a couple of years in the past quantum cryptography – or larger: quantum key distribution – was once the area of simple learn laboratories at universities. yet over the last few years issues replaced. QKD left the laboratories and used to be picked up by means of more effective orientated groups that labored difficult to increase a virtually acceptable expertise out of the fabulous result of uncomplicated research.

One significant milestone in the direction of a QKD know-how used to be a wide examine and improvement undertaking funded via the eu fee that geared toward combining quantum physics with complementary applied sciences which are essential to create a technical answer: electronics, software program, and community elements have been extra in the venture SECOQC (Development of an international community for safe conversation according to Quantum Cryptography) that teamed up all services on eu point to get a expertise for destiny encryption.

The useful program of QKD in a typical optical fibre community was once validated October 2008 in Vienna, giving a glimpse of the way forward for safe conversation. even though many steps have nonetheless to be performed with a purpose to in achieving a true mature know-how, the nook stone for destiny safe conversation is already laid.

QKD usually are not the Holy Grail of safeguard, it's going to no longer manage to resolve all difficulties for evermore. yet QKD has the capability to exchange one of many weakest elements of symmetric encryption: the alternate of the foremost. it may be confirmed that the foremost trade approach can't be corrupted and that keys which are generated and exchanged quantum cryptographically could be safe for ever (as lengthy as a few extra stipulations are kept).

This booklet will express the state-of-the-art of Quantum Cryptography and it'll caricature the way it will be carried out in ordinary conversation infrastructure. The transforming into vulnerability of delicate info calls for new strategies and QKD may be a potential approach to conquer a few of today’s limitations.

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**Extra resources for Applied Quantum Cryptography**

**Example text**

4 A reconciliation protocol R p is ideal if it is both optimal and efficient. Brassard and Salvail determined when their optimal protocol becomes ideal, using the univer sal2 class of hash function H3 [9]. They proved that their protocol is ideal if and only if NP ⊆ BPP, which is a hypothesis. 36 M. Pivk With the fact that a ideal reconciliation protocol depends on a open question in complexity, which is unlikely to be true, we have to find another solution. In Sect. 1 (universal hashing) we had a similar problem.

If the tag with cost w1 does not match but the second does, there must be at least an error in the string of Bob. In the case that both tags do not match, she can assume that either Eve manipulates the messages or the shared keys of Alice and Bob are different. 17) to Bob. Again to avoid the man-in-the-middle attack, Alice must authenticate her message. With the same tag length gauth as Bob’s before, yielding an authentication cost of w4 = 4 · (gauth + log2 log2 g˜ EC ) · log2 g˜ EC . 18) After Bob has compared the tags of Alice with his ones they agree the authentication step for the error correction is complete.

Sci. 22(3), 265–279 (1981) 14, 15, 16, 17, 18, 19 10. : A single quantum cannot be cloned. Nature 299(5886), 802–803 (1982). 1038/299802a0. 1038/299802a0 13 Chapter 3 Quantum Key Distribution M. Pivk In this chapter a complete QKD protocol is presented, starting from the transmission via the quantum channel up to the communication over the public channel. The protocol described here is the BB84 protocol, named after Bennett and Brassard [5]. There are other protocols like the B92 protocol [3], the six-state protocol [8], the SARG protocol [19] and the Ekert protocol [10], which are not discussed here.

### Applied Quantum Cryptography by C. Kollmitzer (auth.), Christian Kollmitzer, Mario Pivk (eds.)

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