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Erschienen in:
Tightly-Secure Encryption in the Multi-user, Multi-challenge Setting with Improved Efficiency Kapitel lesen Erstes Kapitel lesen

2017 | OriginalPaper | Buchkapitel

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

verfasst von : Yanjiang Yang, Joseph Liu, Zhuo Wei, Xinyi Huang

Erschienen in: Information Security and Privacy

Verlag: 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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Vorheriges Kapitel Attribute-Based Encryption with Expressive and Authorized Keyword Search
Nächstes Kapitel Mergeable and Revocable Identity-Based Encryption
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Fußnoten
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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Metadaten
Titel
Towards Revocable Fine-Grained Encryption of Cloud Data: Reducing Trust upon Cloud
verfasst von
Yanjiang Yang
Joseph Liu
Zhuo Wei
Xinyi Huang
Copyright-Jahr
2017
Buch
Information Security and Privacy

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

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

Copyright-Jahr: 2017

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

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