Welcome to the resource topic for 2007/071
Title:
Knowledge-Binding Commitments with Applications in Time-Stamping (Full Version)
Authors: Ahto Buldas, Sven Laur
Abstract:We prove in a non-black-box way that every bounded list and set commitment scheme is knowledge-binding. This is a new and rather strong security condition, which makes the security definitions for time-stamping much more natural compared to the previous definitions, which assume unpredictability of adversaries. As a direct consequence, list and set commitment schemes with partial opening property are sufficient for secure time-stamping if the number of elements has an explicit upper bound N. On the other hand, white-box reductions are in a sense strictly weaker than black-box reductions. Therefore, we also extend and generalize the previously known reductions. The corresponding new reductions are Theta(sqrt(N)) times more efficient, which is important for global-scale time-stamping schemes where N is very large.
ePrint: https://eprint.iacr.org/2007/071
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