A sanitizable signature scheme with aggregation

Authors:
Tetsuya Izu;Noboru Kunihiro;Kazuo Ohta;Masahiko Takenaka;Takashi Yoshioka
Affiliations:
FUJITSU LABORATORIES Ltd., Nakahara-ku, Kawasaki, Japan and The University of Electro-Communications, Chofu, Japan;The University of Electro-Communications, Chofu, Japan;The University of Electro-Communications, Chofu, Japan;FUJITSU LABORATORIES Ltd., Nakahara-ku, Kawasaki, Japan;FUJITSU LABORATORIES Ltd., Nakahara-ku, Kawasaki, Japan
Venue:
ISPEC'07 Proceedings of the 3rd international conference on Information security practice and experience
Year:
2007

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Abstract

A sanitizable signature scheme is a digital signature scheme in which, after generating a signer's signature on a document, specific entities (called sanitizers) can modify the document for hiding partial information. A verifier can confirm the integrity of disclosed parts of the sanitized document from the signature. The sanitizable signature is quite useful in governmental or military offices, where there is a dilemma between disclosure requirements of documents and privacy or diplomatic secrets. In this paper, we construct an efficient and provably secure sanitizable signature scheme with aggregation from bilinear maps, based on a sanitizable signature proposed by Izu et al, by applying the general aggregate signature by Boneh et al. We also propose some efficiency improvements on the proposed scheme by reducing the number of hash values required as verifiers' input.