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Efficient Trapdoor Commitment as Secure as Factoring with Useful Properties

Taek-Young YOUN, Young-Ho PARK, Jongin LIM

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Summary :

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.

Publication
IEICE TRANSACTIONS on Information Vol.E92-D No.12 pp.2520-2523
Publication Date
2009/12/01
Publicized
Online ISSN
1745-1361
DOI
10.1587/transinf.E92.D.2520
Type of Manuscript
LETTER
Category
Application Information Security

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