ON THE POWER OF QUANTUM TAMPER-PROOF DEVICES

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This publication doesn't include Institute of Computer Science. It includes Faculty of Informatics. Official publication website can be found on muni.cz.
Authors

BOUDA Jan MATEUS Paulo PAUNKOVIC Nicola RASGA Joao

Year of publication 2008
Type Article in Periodical
Magazine / Source International Journal of Quantum Information
MU Faculty or unit

Faculty of Informatics

Citation
Field Informatics
Keywords quantum information processing; cryptography
Description We show how quantum tamper-proof devices (QTPD's) can be used to attack and to develop security protocols. On one hand, we prove that it is possible to transfer proofs of zero-knowledge protocols using QTPD's. This attack can be extended to other security schemes where privacy is important. On the other hand, we present a fair contract signing protocol using QTPD's where there is no communication with Judge during the exchange phase (which is impossible classically). In the latter case, we make use of decoherence in the quantum state of the QTPD to implement a global clock over the asynchronous network. QTPD's seem to be possible to implement with existing quantum hardware, due to the fact that it is hard to isolate quantum memory from interference. These theoretical results contribute to justify the implementation of QTPD's.
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