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Erschienen in:
2007 | OriginalPaper | Buchkapitel
Efficient Certificateless Signature Schemes
verfasst von : Kyu Young Choi, Jong Hwan Park, Jung Yeon Hwang, Dong Hoon Lee
Erschienen in: Applied Cryptography and Network Security
Verlag: Springer Berlin Heidelberg
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Recently, in order to eliminate the use of certificates in certified public key cryptography and the key-escrow problem in identity based cryptography, the notion of certificateless public key cryptography was introduced. In this paper, to construct an efficient certificateless signature (CLS) scheme, we present a new approach compactly and orthogonally combining short signatures using bilinear maps. Our approach is conceptually simple but effective to improve efficiency greatly. In the proposed CLS scheme a full private key of a user is a single group element and signature verification requires only one pairing operation. In addition, our CLS scheme has a flexible structure which can be easily extended to a certificateless signature scheme with additional properties such as certificateless ring and blind signature schemes.