[Resource Topic] 2012/380: Several Weak Bit-Commitments Using Seal-Once Tamper-Evident Devices

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Title:
Several Weak Bit-Commitments Using Seal-Once Tamper-Evident Devices

Authors: Ioana Boureanu, Serge Vaudenay

Abstract:

Following both theoretical and practical arguments, we construct UC-secure bit-commitment protocols that place their strength on the sender’s side and are built using tamper-evident devices, e.g., a type of distinguishable, sealed envelopes. We show that by using a second formalisation of tamper-evident distinguishable envelopes we can attain better security guarantees, i.e., EUC-security. We show the relations between several flavours of weak bit-commitments, bit-commitments and distinguishable tamper-evident envelopes. We focus, at all points, on the lightweight nature of the underlying mechanisms and on the end-to-end human verifiability.

ePrint: https://eprint.iacr.org/2012/380

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