期刊
DESIGNS CODES AND CRYPTOGRAPHY
卷 71, 期 2, 页码 331-346出版社
SPRINGER
DOI: 10.1007/s10623-012-9734-y
关键词
Certificateless generalized signcryption; Malicious-but-passive KGC attacks; Gap bilinear Diffie-Hellman assumption; Computational Diffie-Hellman assumption; Random oracle model
资金
- National Nature Science Foundation of China [61103231]
Generalized signcryption can adaptively work as an encryption scheme, a signature scheme or a signcryption scheme with only one algorithm. It is very suitable for storage-constrained environments. In this paper, we introduce a formal security model for certificateless generalized signcryption schemes secure against the malicious-but-passive key generation center attacks and propose a novel scheme. Our scheme is proved to be IND-CCA2 secure under the GBDH assumption and CDH assumption and existentially unforgeable under the GDH' assumption and CDH assumption in random oracle model. Furthermore, performance analysis shows the proposed scheme is efficient and practical.
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