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Title:
CCA2 Secure IBE: Standard Model Efficiency through Authenticated Symmetric Encryption
Authors: Eike Kiltz, Yevgeniy Vahlis
Abstract:We propose two constructions of chosen-ciphertext secure identity-based encryption (IBE) schemes. Our schemes have a security proof in the standard model, yet they offer performance competitive with all known random-oracle based schemes. The efficiency improvement is obtained by combining modifications of the IBE schemes by Waters and Gentry with authenticated symmetric encryption.
ePrint: https://eprint.iacr.org/2008/020
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