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Tightly-Secure Encryption in the Multi-user, Multi-challenge Setting with Improved Efficiency Read chapter Read first chapter

2017 | OriginalPaper | Chapter

Towards Revocable Fine-Grained Encryption of Cloud Data: Reducing Trust upon Cloud

Authors : Yanjiang Yang, Joseph Liu, Zhuo Wei, Xinyi Huang

Published in: Information Security and Privacy

Publisher: Springer International Publishing

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Abstract

ABE (Attribute-based encryption) is capable of fine-grained data encryption, and thus has been studied for secure cloud data sharing. While a number of efforts have been dedicated to resolving the user revocation issue in the multi-user cloud data sharing setting, the trust assumption placed upon the cloud server is still high. In this work, we identify the necessity of achieving verifiability of cloud decryption in the proxy-assisted user revocation approach, so as to weaken the trust assumption on the cloud server. We further formulate a model for the system, and present two independent constructions following the formulation. Experimental results show the practicality of our proposed schemes.

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previous chapter Attribute-Based Encryption with Expressive and Authorized Keyword Search
next chapter Mergeable and Revocable Identity-Based Encryption
Appendix
Available only for authorised users
Footnotes
1
Let’s assume to achieve 80-bit security: \(G_T\) could be instantiated such that \(|G_T| = 512, \ell _0 = 160, \epsilon _{\hbar } = 2^{-80}\), then \(|G_T| -\ell _0 - 2\log (1/\epsilon _{\hbar }) = 512 - 160 - 160 = 192\). It is thus more than enough to enable 160-bit block cipher, which can work in an appropriate mode to encrypt message of an arbitrary length.
 
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Metadata
Title
Towards Revocable Fine-Grained Encryption of Cloud Data: Reducing Trust upon Cloud
Authors
Yanjiang Yang
Joseph Liu
Zhuo Wei
Xinyi Huang
Copyright Year
2017
Book
Information Security and Privacy

Print ISBN: 978-3-319-60054-3

Electronic ISBN: 978-3-319-60055-0

Copyright Year: 2017

DOI
https://doi.org/10.1007/978-3-319-60055-0_7

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