Abstract:

Signcryption key encapsulation mechanism can simultaneously achieve the confidentiality and authentication of the key. Based on the Wa-IBE encryption and the PS-IBS signature, we propose an identitybased signcryption key encapsulation mechanism (IBSC-KEM) and an identity-based multi-recipient signcryption key encapsulation mechanism (mIBSC-KEM) in the standard model. PS-IBS signature is adopted in the new schemes as a signature algorithm and a variant of  Wa-IBE encryption is used by the key encapsulation algorithm. Therefore, the unforgeability and confidentiality of the new schemes are verified in the standard model, and are deduced toward cracking the PS-IBS signature and the Wa-IBE encryption respectively. The new schemes can be used to build secure one-to-one or many-to-one authentication and key exchange schemes.

Key words: identity-based cryptography;multirecipient signcryption;key encapsulation;standard model