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CCA2 secure IBE: Standard model efficiency through authenticated symmetric encryption. (English) Zbl 1153.94400
Malkin, Tal (ed.), Topics in cryptology – CT-RSA 2008. The cryptographers’ track at the RSA conference 2008, San Francisco, CA, USA, April 8–11, 2008. Proceedings. Berlin: Springer (ISBN 978-3-540-79262-8/pbk). Lecture Notes in Computer Science 4964, 221-238 (2008).
Summary: 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 B. Waters [Lect. Notes Comput. Sci. 3494, 114–127 (2005; Zbl 1137.94360)] and C. Gentry [Lect. Notes Comput. Sci. 4004, 445–464 (2006; Zbl 1140.94340)] with authenticated symmetric encryption.
For the entire collection see [Zbl 1134.94002].

94A60 Cryptography
94A62 Authentication, digital signatures and secret sharing
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