A note on the Certificateless Multi-receiver Signcryption Scheme.

Certificateless cryptography aims at combining the advantages of identity based and public key cryptography, so as to avoid the key escrow problem inherent in the identity based system and cumbersome certificate management in public key infrastructure. Signcryption achieves confidentiality and authentication simultaneously in an efficient manner. Multi-receiver signcryption demands signcrypting the same message efficiently for a large number of receivers. In this note, we strengthen the security of the certificateless multi-receiver signcryption scheme in [23] by proposing suitable enhancement to the scheme.