Cryptanalysis And Design Of Bilinear Pairing-based Public Key Encryption And Signcryption Cryptosystems

This paper concentrates on the research of bilinear pairing-based publickey encryption and signcryption cryptosystems and achieves the following results:gives a concrete analysis of Pang et al.’s public key encryption scheme withone-encryption and multi-decryption and indicates that their scheme does not meetforward secrecy as they claimed; gives a concrete analysis of Li et al.’s improvedmulti-receiver (ID-Based) signcryption scheme and indicates that their scheme doesnot meet IND-CCA2security as they claimed; gives a concrete analysis of Zhao etal.’s efficient multi-PKG ID-Based signcryption scheme and indicates that theirscheme does not meet IND-CCA2security as they claimed, then improves theirscheme to make it defeat the above attack and presents an implementation of theimproved scheme; gives a concrete analysis of Zhang et al.’s attribute-basedkey-insulated signcryptiuon scheme with bidirectional anonymity and indicates thattheir scheme does not meet unforgeability as they claimed.