Public-key puncturable encryption: modular and compact constructions

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Abstract

We revisit the method of designing public-key puncturable encryption schemes and present a generic conversion by leveraging the techniques of distributed key-distribution and revocable encryption. In particular, we first introduce a refined version of identity-based revocable encryption, named key-homomorphic identity-based revocable key encapsulation mechanism with extended correctness. Then, we propose a generic construction of puncturable key encapsulation mechanism from the former by merging the idea of distributed key-distribution. Compared to the state-of-the-art, our generic construction supports unbounded number of punctures and multiple tags per message, thus achieving more fine-grained revocation of decryption capability. Further, it does not rely on random oracles, not suffer from non-negligible correctness error, and results in a variety of efficient schemes with distinct features. More precisely, we obtain the first scheme with very compact ciphertexts in the standard model, and the first scheme with support for both unbounded size of tags per ciphertext and unbounded punctures as well as constant-time puncture operation. Moreover, we get a comparable scheme proven secure under the standard DBDH assumption, which enjoys both faster encryption and decryption than previous works based on the same assumption, especially when the number of tags associated with the ciphertext is large.

Original languageEnglish
Title of host publicationPublic-Key Cryptography – PKC 2020
Subtitle of host publication23rd IACR International Conference on Practice and Theory of Public-Key Cryptography Edinburgh, UK, May 4–7, 2020 Proceedings, Part I
EditorsAggelos Kiayias, Markulf Kohlweiss, Petros Wallden, Vassilis Zikas
Place of PublicationCham Switzerland
PublisherSpringer
Pages309-338
Number of pages30
ISBN (Electronic)9783030453749
ISBN (Print)9783030453732
DOIs
Publication statusPublished - 2020
EventInternational Conference/Workshop on Practice and Theory in Public Key Cryptography 2020 - Online
Duration: 1 Jun 20204 Jun 2020
Conference number: 23rd
https://link.springer.com/book/10.1007/978-3-030-45388-6 (Proceedings)
https://pkc.iacr.org/2020/ (Website)

Publication series

NameLecture Notes in Computer Science
PublisherSpringer
Volume12110
ISSN (Print)0302-9743
ISSN (Electronic)1611-3349

Conference

ConferenceInternational Conference/Workshop on Practice and Theory in Public Key Cryptography 2020
Abbreviated titlePKC 2020
Period1/06/204/06/20
Internet address

Keywords

  • Forward security
  • Functional encryption
  • Puncturable encryption

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