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Efficient Trapdoor Commitment as Secure as Factoring with Useful Properties

Authors
Youn, Taek-YoungPark, Young-HoLim, Jongin
Issue Date
Dec-2009
Publisher
IEICE-INST ELECTRONICS INFORMATION COMMUNICATIONS ENG
Keywords
security; trapdoor commitment; key exposure freeness; strong trapdoor opening; integer factoring problem
Citation
IEICE TRANSACTIONS ON INFORMATION AND SYSTEMS, v.E92D, no.12, pp.2520 - 2523
Indexed
SCIE
SCOPUS
Journal Title
IEICE TRANSACTIONS ON INFORMATION AND SYSTEMS
Volume
E92D
Number
12
Start Page
2520
End Page
2523
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/118879
DOI
10.1587/transinf.E92.D.2520
ISSN
0916-8532
Abstract
Trapdoor commitment schemes are widely used for adding valuable properties to ordinary signatures or enhancing the security of weakly secure signatures. In this letter. we propose a trapdoor commitment scheme based on RSA function, and prove its security under the hardness of the integer factoring. Our scheme is very efficient in computing a commitment. Especially. it requires only three multiplications for evaluating a commitment when e = 3 is used as a public exponent of RSA function. Moreover, our scheme has two useful properties, key exposure freeness and strong trapdoor opening. which are useful for designing secure chameleon signature schemes and converting a weakly secure signature to a strongly secure signature, respectively.
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