DRM Oriented Authenticated Group Key Agreement Scheme from Multilinear Form

We propose a DRM oriented authenticated group key agreement scheme from multilinear forms. The new scheme is ID-based, but need not trusted PKG and random oracle model, which effectively solves the key escrow problem. Our scheme can be used to replace the keys distribution scheme of existing DRM system, which avoids the trouble to build trusted channels between each pairs of users. The ID-based cryptography mechanism and multilinear forms are applied here not only provides end-to-end authenticity and confidentiality, but also saves network bandwidth and computational overhead of DRM system.