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By N Fazio

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Additional resources for On Cryptographic Techniques for Digital Rights Management

Example text

In the first 47 case, the idea is to introduce a suitable number of clones of the universe of keys, and for each key that a user was supposed to get in the original scheme, he now receives a random key-clone from the corresponding set. Tracing is then based on the fact that different users are not likely to share the same random key-clones. 2). In the second case (adding revocation to traitor tracing schemes), the universe of keys is again cloned, but this time each user gets all the key-clones corresponding to his original set of keys, so that the storage per user increases.

In [10], Berkovits proposed a broadcast scheme that, although requiring communication, encryption and decryption complexity linear in the number of recipients N − r, introduces an approach largely employed (in a revised form) in subsequent work. The scheme of [10] is based on Shamir’s “k out of m” secret sharing scheme [73]: a secret s from a finite field Fp is encoded as the constant term of some polynomial P over Fp of degree k, and each participant gets a “share” consisting of the value of P at some point xi (where the points assigned to all the users are assumed to be pairwise distinct).

Thus, the restriction on Corrupt queries from Phase 2 also holds in Phase 1. Definition 16 (Chosen-Ciphertext Security for IBE). An IBE scheme EIBE is (τ, qID , qC , εIBE )-IND-ID-CCA (resp. IND-ID-CCA (resp. IND-sID-CCA) adversary A that makes at most qID chosen Corrupt queries and at most qC chosen Decrypt queries, it holds that AdvIBE,A < εIBE . We define chosen-plaintext security for an IBE scheme according to an attack game that is defined exactly as described above, except that the adversary is not allowed to issue Decrypt queries.

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On Cryptographic Techniques for Digital Rights Management by N Fazio


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