RSA-TBOS signcryption with proxy re-encryption

The recent attack on Apple iTunes Digital Rights Management [17] has brought to light the usefulness of proxy re-encryption schemes for Digital Rights Management. It is known that the use of proxy reencryption would have prevented the attack in [17]. With this utility in mind and with the added requirement of non-repudiation, we propose the first ever signcryption scheme with proxy re-encryption that does not involve bilinear maps. Our scheme is called RSA-TBOS-PRE and is based on the RSA-TBOS signcryption scheme of Mao and Malone-Lee [7]. We adapt various models available in the literature concerning authenticity, unforgeability and non-repudiation and propose a signature non-repudiation model suitable for signcryption schemes with proxy reencryption. We show the non-repudiability of our scheme in this model. We also introduce and define a new security notion of Weak-IND-CCA2, a slightly weakened adaptation of the IND-CCA2 security model for signcryption schemes and prove that RSA-TB...

• Type: Conference
• Year: 2008
• Where: DRM
• Authors: Varad Kirtane, C. Pandu Rangan
• Keywords: Artificial Intelligence, Bilinear Maps, Digital Rights Management, DRM 2008, Signcryption Schemes