Fully secure ciphertext-policy attribute based encryption with security mediator

Yuechen Chen, Zoe L. Jiang, S. M. Yiu, Joseph K. Liu, Man Ho Allen Au, Xuan Wang

Research output: Chapter in Book/Report/Conference proceedingConference PaperResearchpeer-review

11 Citations (Scopus)


Attribute-Based Encryption (ABE) offers fine-grained decryption policy such that users can do decryption if their attributes satisfy the policy. Such flexibility enables it applicable in various applications in government and business. However, there are two issues that should be solved first before it is deployed in practice, namely user revocation and decryption outsourcing. In this paper, we adopt the slightly modified Lewko et al.’s fully-CCA-secure Ciphertext-Policy-ABE (CPABE) combining with Boneh et al.’s idea of mediated cryptography to propose a CP-ABE with SEcurity Mediator (SEM) supporting immediate user revocation. At the same time, by the introduce of SEM, we intendedly outsource most of the computation workload in decryption to SEM side and leave only one exponentiation and one division at user side for decryption. It is proved fully-RCCA-CCA-secure in random oracle model.

Original languageEnglish
Title of host publicationInformation and Communications Security
Subtitle of host publication16th International Conference, ICICS 2014 Hong Kong, China, December 16–17, 2014 Revised Selected Papers
EditorsLucas C.K. Hui, S.H. Qing, Elaine Shi, S.M. Yiu
Place of PublicationCham Switzerland
Number of pages16
ISBN (Electronic)9783319219660
ISBN (Print)9783319219653
Publication statusPublished - 2015
Externally publishedYes
EventInternational Conference on Information and Communications Security 2014 - Hong Kong, China
Duration: 16 Dec 201417 Dec 2014
Conference number: 16th
https://link.springer.com/book/10.1007/978-3-319-21966-0 (Proceedings)

Publication series

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


ConferenceInternational Conference on Information and Communications Security 2014
Abbreviated titleICICS 2014
CityHong Kong
Internet address


  • CP-ABE
  • Decryption outsourcing
  • Dual encryption system
  • Security mediator
  • User revocation

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