Sanjay Bhattacherjee

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The Subset Difference (SD) method proposed by Naor-Naor-Lotspeich is the most popular broadcast encryption (BE) scheme. It is suitable for real-time applications like Pay-TV. It has been suggested for use by the AACS standard for digital rights management in Blu-Ray and DVD discs. The SD method assumes the number of users to be a power of two. (1) We(More)
The most influential broadcast encryption (BE) scheme till date was introduced in 2001 by Naor, Naor and Lotspiech (NNL) and is based on binary trees. This paper generalizes the ideas of NNL to obtain BE schemes based on k-ary trees for any k ≥ 2. The treatment is uniform across all k and essentially provides a single scheme which is parameterized by the(More)
We provide e cient constructions for trace-and-revoke systems with public traceability in the black-box con rmation model. Our constructions achieve adaptive security, are based on standard assumptions and achieve signi cant e ciency gains compared to previous constructions. Our constructions rely on a generic transformation from inner product functional(More)
For Application Specific Integrated Circuits (ASIC) and System-on-Chip (SOC) designs , Cell Based Design (CBD) is the most prevalent practice as it guarantees a shorter design cycle ,minimizes errors and is easier to maintain . In modern ASIC design, standard cell methodology is practiced with sizeable libraries of cells, each containing multiple(More)
In Broadcast Encryption (BE) systems like Pay-TV, AACS, online content sharing and broadcasting, reducing the header length (communication overhead per session) is of practical interest. The Subset Difference (SD) scheme due to Naor-Naor-Lotspiech (NNL) is the most popularly used BE scheme. It assumes an underlying full binary tree to assign keys to subsets(More)
Broadcast Encryption (BE) is an important technique for digital rights management (DRM). Two key parameters of a BE scheme are the average size of the transmission overhead and the size of the secret information to be stored by the users. The most important BE scheme till date is the subset difference (SD) scheme proposed by Naor, Naor and Lotspiech in 2001(More)
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