1210.5681 (Guang Ping He)

(In)security of quantum oblivious transfer based on secure bit
commitment    [PDF]

Guang Ping He

While unconditionally secure bit commitment (BC) is considered impossible within the quantum framework, it can be obtained under relativistic or other settings. Here we study whether these 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. On the other hand, it is also found that some other no-go proofs become invalid in this scenario, because their models of cryptographic protocols are too ideal to cover BC-based QOT.

View original: http://arxiv.org/abs/1210.5681