Self-certified identity-based signcryption in DRM

Authentication and encryption technology are the core components of the DRM (Digital Rights Management) system. In this paper, a security protocol basing on the identity-based signcryption scheme is proposed to implement these technologies simultaneously. According to the comparison with the PKI (public key infrastructure)-based DRM system, the advantages of this protocol are proved. However, in practice the application of the identity-based cryptosystems is limited by the key escrow and distribution problems. In order to solve these problems, we proposed a new self-certified identity-based signcryption scheme, in which partial data chosen by the users are added to the private key. This scheme is proved that it can successfully avoid the key escrow and distribution problems, and is more secure and effective in practice.