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Identity-Based Encryption Tightly Secure Under Chosen-Ciphertext Attacks

Authors:
Dennis Hofheinz
Dingding Jia
Jiaxin Pan
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DOI: 10.1007/978-3-030-03329-3_7
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Presentation: Slides
Conference: ASIACRYPT 2018
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.
BibTeX
@inproceedings{asiacrypt-2018-29163,
  title={Identity-Based Encryption Tightly Secure Under Chosen-Ciphertext Attacks},
  booktitle={Advances in Cryptology – ASIACRYPT 2018},
  series={Lecture Notes in Computer Science},
  publisher={Springer},
  volume={11273},
  pages={190-220},
  doi={10.1007/978-3-030-03329-3_7},
  author={Dennis Hofheinz and Dingding Jia and Jiaxin Pan},
  year=2018
}