Deterministic Public-Key Encryption Under Continual Leakage

  • Venkata Koppula
  • Omkant Pandey
  • Yannis Rouselakis
  • Brent  Waters
Conference paper

DOI: 10.1007/978-3-319-39555-5_17

Part of the Lecture Notes in Computer Science book series (LNCS, volume 9696)
Cite this paper as:
Koppula V., Pandey O., Rouselakis Y., Waters B. (2016) Deterministic Public-Key Encryption Under Continual Leakage. In: Manulis M., Sadeghi AR., Schneider S. (eds) Applied Cryptography and Network Security. ACNS 2016. Lecture Notes in Computer Science, vol 9696. Springer, Cham

Abstract

Deterministic public-key encryption, introduced by Bellare, Boldyreva, and O’Neill (CRYPTO 2007), is an important technique for searchable encryption; it allows quick, logarithmic-time, search over encrypted data items. The technique is most effective in scenarios where frequent search queries are performed over a huge database of unpredictable data items. We initiate the study of deterministic public-key encryption (D-PKE) in the presence of leakage. We formulate appropriate security notions for leakage-resilient D-PKE, and present constructions that achieve them in the standard model. We work in the continual leakage model, where the secret-key is updated at regular intervals and an attacker can learn arbitrary but bounded leakage on the secret key during each time interval. We, however, do not consider leakage during the updates. Our main construction is based on the (standard) linear assumption in bilinear groups, tolerating up to \(0.5-o(1)\) fraction of arbitrary leakage. The leakage rate can be improved to \(1-o(1)\) by relying on the SXDH assumption.

At a technical level, we propose and construct a “continual leakage resilient” version of the all-but-one lossy trapdoor functions, introduced by Peikert and Waters (STOC 2008). Our formulation and construction of leakage-resilient lossy-TDFs is of independent general interest for leakage-resilient cryptography.

Keywords

Deterministic public key encryption Leakage resilient cryptography Lossy trapdoor functions 

Copyright information

© Springer International Publishing Switzerland 2016

Authors and Affiliations

  • Venkata Koppula
    • 1
  • Omkant Pandey
    • 2
  • Yannis Rouselakis
    • 3
  • Brent  Waters
    • 1
  1. 1.University of Texas at AustinAustinUSA
  2. 2.Drexel UniversityPhiladelphiaUSA
  3. 3.MicrosoftRedmondUSA

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