Adaptive Witness Encryption and  Asymmetric Password-based Cryptography

Mihir Bellare; Viet Tung Hoang

Paper 2013/704

Adaptive Witness Encryption and Asymmetric Password-based Cryptography

Mihir Bellare and Viet Tung Hoang

Abstract

We show by counter-example that the soundness security requirement for witness encryption given by Garg, Gentry, Sahai and Waters (STOC 2013) does not suffice for the security of their own applications. We introduce adaptively-sound (AS) witness encryption to fill the gap. We then introduce asymmetric password-based encryption (A-PBE). This offers gains over classical, symmetric password-based encryption in the face of attacks that compromise servers to recover hashed passwords. We distinguish between invasive A-PBE schemes (they introduce new password-based key-derivation functions) and non-invasive ones (they can use existing, deployed password-based key-derivation functions). We give simple and efficient invasive A-PBE schemes and use AS-secure witness encryption to give non-invasive A-PBE schemes.

Metadata

Available format(s): PDF
Category: Foundations
Publication info: A major revision of an IACR publication in Pkc 2015
Keywords: Passwords witness encryption
Contact author(s): vth005 @ eng ucsd edu
History: 2015-02-12: last of 3 revisions; 2013-11-03: received; See all versions
Short URL: https://ia.cr/2013/704
License: CC BY

BibTeX

@misc{cryptoeprint:2013/704,
      author = {Mihir Bellare and Viet Tung Hoang},
      title = {Adaptive Witness Encryption and  Asymmetric Password-based Cryptography},
      howpublished = {Cryptology ePrint Archive, Paper 2013/704},
      year = {2013},
      note = {\url{https://eprint.iacr.org/2013/704}},
      url = {https://eprint.iacr.org/2013/704}
}