A tag based encoding: An efficient encoding for predicate encryption in prime order groups

Jongkil Kim, Willy Susilo, Fuchun Guo, Man Ho Allen Au

Research output: Chapter in book / Conference proceedingConference article published in proceeding or bookAcademic researchpeer-review

6 Citations (Scopus)


We introduce a tag based encoding, a new generic framework for modular design of Predicate Encryption (PE) schemes in prime order groups. Our framework is equipped with a compiler which is adaptively secure in prime order groups under the standard Decisional Linear Assumption (DLIN). Compared with prior encoding frameworks in prime order groups which require multiple group elements to interpret a tuple of an encoding in a real scheme, our framework has a distinctive feature which is that each element of an encoding can be represented with only a group element and an integer. This difference allows us to construct amore efficient encryption scheme. In the current literature, the most efficient compiler was proposed by Chen, Gay and Wee (CGW) in Eurocrypt’15. It features one tuple of an encoding into two group elements under the Symmetric External Diffie-Hellman assumption (SXDH). Compared with their compiler, our encoding construction saves the size of either private keys or ciphertexts up-to 25% and reduces decryption time and the size of public key up-to 50% in 128 security level. Several new schemes such as inner product encryption with short keys, dual spatial encryption with short keys and hierarchical identity based encryption with short ciphertexts are also introduced as instances of our encoding.
Original languageEnglish
Title of host publicationSecurity and Cryptography for Networks - 10th International Conference, SCN 2016, Proceedings
PublisherSpringer Verlag
Number of pages20
ISBN (Print)9783319446172
Publication statusPublished - 1 Jan 2016
Event10th International Conference on Security and Cryptography for Networks, SCN 2016 - Amalfi, Italy
Duration: 31 Aug 20162 Sep 2016

Publication series

NameLecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)
Volume9841 LNCS
ISSN (Print)0302-9743
ISSN (Electronic)1611-3349


Conference10th International Conference on Security and Cryptography for Networks, SCN 2016


  • Encodings
  • Inner product encryption
  • Predicate encryption
  • Prime order groups
  • Spatial encryption

ASJC Scopus subject areas

  • Theoretical Computer Science
  • Computer Science(all)

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