Proxy signcryption, proposed by Gamage et al. , is a cryptographic primitive, which combines the functionality of a proxy signature scheme with that of an encryption. But to date, no formal definitions of security have been provided. In this paper, we first propose the syntax of warrant-based proxy signcryption scheme, then formalize notions of security for it. After that, we present a warrant-based proxy signcryption scheme based on integer factorization assumption.
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- Constructing Secure Warrant-Based Proxy Signcryption Schemes
- Springer Berlin Heidelberg
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