Identity Based Threshold Proxy Signcryption Scheme

An identity based cryptosystem is a novel type of public cryptographic scheme in which the public keys of the users are their identities or strings derived from their identities. In a ( nt, ) proxy signature scheme, the original signer can delegate his/her signing capability to n proxy signers such that any t or more proxy signers can sign messages on behalf of the former, but 1−t or less of them cannot do the same thing. However, in many situations we want to enjoy confidentiality, authenticity and non-repudiation of message simultaneously. In this paper we propose an identity based threshold proxy signcryption scheme using bilinear pairings. The security of the scheme is also analyzed.

• Type: Conference
• Year: 2005
• Where: IEEECIT
• Authors: Meng Wang, Zhijing Liu
• Keywords: IEEECIT 2005, Information Technology, Proxy Signature Scheme, Proxy Signers, Public Cryptographic Scheme