Reducing complexity assumptions for statistically-hiding commitment

Iftach Haitner*, Omer Horvitz, Jonathan Katz, Chiu Yuen Koo, Ruggero Morselli, Ronen Shaltiel

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

6 Scopus citations


We revisit the following question: what are the minimal assumptions needed to construct statistically-hiding commitment schemes? Naor et al. show how to construct such schemes based on any one-way permutation. We improve upon this by showing a construction based on any approximable preimage-size one-way function. These are one-way functions for which it is possible to efficiently approximate the number of pre-images of a given output. A special case is the class of regular one-way functions where all points in the image of the function have the same (known) number of pre-images. We also prove two additional results related to statistically-hiding commitment. First, we prove a (folklore) parallel composition theorem showing, roughly speaking, that the statistical hiding property of any such commitment scheme is amplified exponentially when multiple independent parallel executions of the scheme are carried out. Second, we show a compiler which transforms any commitment scheme which is statistically hiding against an honest-but-curious receiver into one which is statistically hiding even against a malicious receiver.

Original languageEnglish
Pages (from-to)283-310
Number of pages28
JournalJournal of Cryptology
Issue number3
StatePublished - Jul 2009
Externally publishedYes


FundersFunder number
National Science Foundation0447075
Army Research OfficeDAAD19-01-1-0494
United States-Israel Binational Science Foundation2004329, 2002246


    • Bit commitment
    • Regular one way functions
    • Statistical hiding


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