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In this position paper, we report the progress of our project to analyze security of the traitor tracing technology used in Advanced Access Content System (AACS). For a simplified problem that all sequence keys are statically assigned according to known Reed Solomon (RS) codes, and a colluder is to be identified with the traitor tracing, we present a mix-and-match colluding attack to victimize an...
Digital rights management (DRM) is widely used to protect intellectual property for content owners but consumer privacy is sacrificed. A user's playing statistics can be collected by the client DRM module and the license server. In this paper, we propose a DRM system in which the license server can generate the content decryption key for a user to play an encrypted content object without gaining any...
In this paper we introduce a cryptosystem based on the quotient groups of the group of rational points of an elliptic curve defined over p-adic number field. Some additional parameters are taken in this system, which have an advantage in performing point multiplication while keeping the security of ECC over finite fields. We give a method to select generators of the cryptographic groups, and give...
The key management for multi-type, multi-level scalable access control of a fine granularity scalability codestream is addressed in this paper. We first present an efficient partially ordered set (poset) to represent scalable access control so that any access control schemes for a poset can be applied and a single secret key is needed to transfer to a user. We then present a secure key scheme modified...
The recently proposed scalable multi-layer FGS (fine granularity scalability) encryption (SMLFE) encrypts an MPEG-4 FGS stream into multiple PSNR and bitrate quality layers for layered access control. Both layer types are supported simultaneously. A simple key scheme was used in SMLFE. We propose a novel key scheme for SMLFE that reduces the number of keys maintained and managed by a license server...
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