[Resource Topic] 2010/107: Adaptive Concurrent Non-Malleability with Bare Public-Keys

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Title:
Adaptive Concurrent Non-Malleability with Bare Public-Keys

Authors: Andrew C. Yao, Moti Yung, Yunlei Zhao

Abstract:

Coin-tossing (CT) is one of the earliest and most fundamental protocol problems in the literature. In this work, we formalize and construct (constant-round) concurrent non-malleable coin-tossing (CNMCT) in the bare public-key (BPK) model. The CNMCT protocol can, in particular, be used to transform CNM zero-knowledge (CNMZK) in the common random string (CRS) model into the BPK model with full adaptive input (statements and language) selection. Here, full adaptive input selection in the public-key model means that the concurrent man-in-the-middle (CMIM) adversary can adaptively set statements to all sessions at any point of the concurrent execution evolution (not necessarily at the beginning of each session), and can set the underlying language based upon honest players’ public-keys.

ePrint: https://eprint.iacr.org/2010/107

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