on 01-09-2014
The 2014 European Signal Processing Conference (EUSIPCO-2014) is the
22nd of its kind organized by the European Association for Signal
Processing (EURASIP, www.eurasip.org ). The conference will be held at
the Lisbon Congress Center, in Lisbon, Portugal, and is hosted by
Instituto de Telecomunicações (IT, www.it.pt) and by INESC-ID
(www.inesc-id.pt). The focus will be on signal processing theory,
algorithms, and applications.
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on 25-07-2014
Ricardo Loura, SQIG - IT
25/07/2014, 16:15 — Room P3.10, Mathematics Building, IST.
Commitment schemes are fundamental primitives in ryptography. In particular, a Bit Commitment (BC) scheme allows one user, Alice, to choose a bit value b={0,1}, and upon request prove to a second user, Bob, that the value she chose was indeed b. The protocol is said to be secure if Alice is unable to change her mind once the choice is ade,
and Bob is unable to discover Alice’s choice until she willingly presents her proof. Unfortunately, there are no unconditionally secure BC protocols, meaning that the security of BC protocols relies on some assumptions. In the classical world, these assumptions are of computational nature. In this work, we present a BC protocol which akes
use of quantum mechanical phenomena, and whose security is based on technological limitations rather than computational hardness.
Furthermore, we carefully analyse the effects of noise throughout the entirety of the protocol, and prove that, in a sense, it is always advantageous for a cheating Alice to introduce extra noise prior to her measurements.
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