Paper 2015/297

Identity-Based Encryption Secure Against Selective Opening Chosen-Ciphertext Attack

Junzuo Lai, Robert H. Deng, Shengli Liu, Jian Weng, and Yunlei Zhao

Abstract

Security against selective opening attack (SOA) requires that in a multi-user setting, even if an adversary has access to all ciphertexts from users, and adaptively corrupts some fraction of the users by exposing not only their messages but also the random coins, the remaining unopened messages retain their privacy. Recently, Bellare, Waters and Yilek considered SOA-security in the identity-based setting, and presented the first identity-based encryption (IBE) schemes that are proven secure against selective opening chosen plaintext attack (SO-CPA). However, how to achieve SO-CCA security for IBE is still open. In this paper, we introduce a new primitive called extractable IBE, which is a hybrid of one-bit IBE and identity-based key encapsulation mechanism (IB-KEM), and define its IND-ID-CCA security notion. We present a generic construction of SO-CCA secure IBE from an IND-ID-CCA secure extractable IBE with ``One-Sided Public Openability''(1SPO), a collision-resistant hash function and a strengthened cross-authentication code. Finally, we propose two concrete constructions of extractable 1SPO-IBE schemes, resulting in the first simulation-based SO-CCA secure IBE schemes without random oracles.

Metadata
Available format(s)
PDF
Category
Public-key cryptography
Publication info
A minor revision of an IACR publication in EUROCRYPT 2014
Contact author(s)
laijunzuo @ gmail com
pwdlaijunzuo @ 163 com
History
2015-04-01: received
Short URL
https://ia.cr/2015/297
License
Creative Commons Attribution
CC BY

BibTeX

@misc{cryptoeprint:2015/297,
      author = {Junzuo Lai and Robert H.  Deng and Shengli Liu and Jian Weng and Yunlei Zhao},
      title = {Identity-Based Encryption Secure Against Selective Opening Chosen-Ciphertext Attack},
      howpublished = {Cryptology ePrint Archive, Paper 2015/297},
      year = {2015},
      note = {\url{https://eprint.iacr.org/2015/297}},
      url = {https://eprint.iacr.org/2015/297}
}
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