Identity-based server-aided decryption

Joseph K. Liu, Cheng-Kang Chu, Jianying Zhou

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

7 Citations (Scopus)


Identity-Based Cryptosystem plays an important role in the modern cryptography world, due to the elimination of the costly certificate. However, all practical identity-based encryption schemes require pairing operation in the decryption stage. Pairing is a heavy mathematical algorithm, especially for resource-constrained devices such as smart cards or wireless sensors. In other words, decryption can hardly be done in these devices if identity-based cryptosystem is employed. We solve this problem by proposing a new notion called Identity-Based Server-Aided Decryption. It is similar to normal identity-based encryption scheme, but it further enables the receiver to decrypt the ciphertext without needing to compute pairing with the assistance of an external server. Secure mechanisms are provided to detect whether the server has computed correctly and prevent the server from getting any information about the plaintext or the user secret key. We give two concrete instantiations of this notion.

Original languageEnglish
Title of host publicationInformation Security and Privacy - 16th Australasian Conference, ACISP 2011, Proceedings
Number of pages16
Volume6812 LNCS
ISBN (Print)9783642224966
Publication statusPublished - 2011
Externally publishedYes
EventAustralasian Conference on Information Security and Privacy 2011 - Melbourne, Australia
Duration: 11 Jul 201113 Jul 2011
Conference number: 16th (Proceedings)

Publication series

NameLecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)
Volume6812 LNCS
ISSN (Print)03029743
ISSN (Electronic)16113349


ConferenceAustralasian Conference on Information Security and Privacy 2011
Abbreviated titleACISP 2011
Internet address

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