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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...
In this paper, we present an encryption scheme for MPEG-4 FGS which provides the same or a little coarser granularity of scalability after encryption. The scheme encrypts compressed data of each video packet or block independently. Initialization vectors are generated with a method to minimize the overhead. The scalability provided in an encrypted codestream using this scheme enables intermediate...
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...
The Yeung-Mintzer (Y-M) image authentication scheme has been well studied. Several vulnerabilities and modified schemes to fix them have been reported. In this paper, we propose a novel oracle attack on the Y-M scheme and its variations. Our attack is very different from the previously proposed attacks. A single authenticated image plus access to a verifier (oracle) is enough in our attack. The verifier...
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