Can relativistic bit commitment lead to secure quantum oblivious transfer?
arXiv:1210.5681 · doi:10.1140/epjd/e2015-50882-4
Abstract
While unconditionally secure bit commitment (BC) is considered impossible within the quantum framework, it can be obtained under relativistic or experimental constraints. Here we study whether such BC can lead to secure quantum oblivious transfer (QOT). The answer is not completely negative. On one hand, we provide a detailed cheating strategy, showing that the "honest-but-curious adversaries" in some of the existing no-go proofs on QOT still apply even if secure BC is used, enabling the receiver to increase the average reliability of the decoded value of the transferred bit. On the other hand, it is also found that some other no-go proofs claiming that a dishonest receiver can always decode all transferred bits simultaneously with reliability 100% become invalid in this scenario, because their models of cryptographic protocols are too ideal to cover such a BC-based QOT.
Published version. This paper generalized some results in Sec. V of arXiv:1101.4587, and pointed out the limitation of the proof in arXiv:quant-ph/9611031
References in corpus (8)
- Experimental bit commitment based on quantum communication and special relativity
- Experimental implementation of bit commitment in the noisy-storage model
- An Experimental Implementation of Oblivious Transfer in the Noisy Storage Model
- Experimental unconditionally secure bit commitment
- Remote preparation of arbitrary ensembles and quantum bit commitment
- Noise and measurement errors in a practical two-state quantum bit commitment protocol
- The relationship between two flavors of oblivious transfer at the quantum level
- The cryptographic power of misaligned reference frames