Welcome to the resource topic for 2018/834
Title:
Identity-based Encryption Tightly Secure under Chosen-ciphertext Attacks
Authors: Dennis Hofheinz, Dingding Jia, Jiaxin Pan
Abstract:We propose the first identity-based encryption (IBE) scheme that is (almost) tightly secure against chosen-ciphertext attacks. Our scheme is efficient, in the sense that its ciphertext overhead is only seven group elements, three group elements more than that of the state-of-the-art passively (almost) tightly secure IBE scheme. Our scheme is secure in a multi-challenge setting, i.e., in face of an arbitrary number of challenge ciphertexts. The security of our scheme is based upon the standard symmetric external Diffie-Hellman assumption in pairing-friendly groups, but we also consider (less efficient) generalizations under weaker assumptions.
ePrint: https://eprint.iacr.org/2018/834
Slides: https://asiacrypt.iacr.org/2018/files/SLIDES/TUESDAY/514/AC18JIA.pdf
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