Signcryption from Randomness Recoverable PKE Revisited

摘要

A new generic construction of a signcryption scheme from randomness recoverable public key encryption (PKE-RR) is proposed. This paper modifies the 'Li & Wong' construction [Information Sciences 180 (2010)] to achieve better security from weaker building blocks and thereby making it open to a larger class of encryption find signature schemes. The proposed construction achieves multi-user insider security for confidentiality in random oracle model and authenticity in standard model. It is done by incorporating one extra hashing in both signcryption and unsigncryption phases than the original construction.