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2015 | OriginalPaper | Buchkapitel

Accountable Authority Ciphertext-Policy Attribute-Based Encryption with White-Box Traceability and Public Auditing in the Cloud

verfasst von : Jianting Ning, Xiaolei Dong, Zhenfu Cao, Lifei Wei

Erschienen in: Computer Security -- ESORICS 2015

Verlag: Springer International Publishing

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Abstract

As a sophisticated mechanism for secure fine-grained access control, ciphertext-policy attribute-based encryption (CP-ABE) is a highly promising solution for commercial applications such as cloud computing. However, there still exists one major issue awaiting to be solved, that is, the prevention of key abuse. Most of the existing CP-ABE systems missed this critical functionality, hindering the wide utilization and commercial application of CP-ABE systems to date. In this paper, we address two practical problems about the key abuse of CP-ABE: (1) The key escrow problem of the semi-trusted authority; and, (2) The malicious key delegation problem of the users. For the semi-trusted authority, its misbehavior (i.e., illegal key (re-)distribution) should be caught and prosecuted. And for a user, his/her malicious behavior (i.e., illegal key sharing) need be traced. We affirmatively solve these two key abuse problems by proposing the first accountable authority CP-ABE with white-box traceability that supports policies expressed in any monotone access structures. Moreover, we provide an auditor to judge publicly whether a suspected user is guilty or is framed by the authority.

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Vorheriges Kapitel Attribute Based Broadcast Encryption with Short Ciphertext and Decryption Key

Nächstes Kapitel DexHunter: Toward Extracting Hidden Code from Packed Android Applications

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We assume that \(\mathbb {A}\) is implicitly in the ciphertext ct.

We assume that the identity id is an element in \(\mathbb {Z}_n\). One can extend the construction to arbitrary identities in \(\{0,1\}^*\) easily by adopting a collision-resistant hash \(H:\{0,1\}^* \rightarrow \mathbb {Z}_n\).

where A is an \(l\times n\) matrix and \(\rho \) is a map from each row \(A_j\) of A to an attribute \(\rho (j)\).

i.e. the decryption privilege of the key is described by attribute set \(S_\tau =\{x|x\in S\wedge e(K_x,g)=e(\mathcal {U}_x,L'(L)^{T})\ne 1 \}\).

Note that \(R'_0\) makes the \(G_{p_3}\) part of \(L'\) uncorrelated to the \(G_{p_3}\) part of L, this is why our simulator needs \(g_3\).

Note that this two instances are independent from each other.

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Titel: Accountable Authority Ciphertext-Policy Attribute-Based Encryption with White-Box Traceability and Public Auditing in the Cloud
verfasst von: Jianting Ning
Xiaolei Dong
Zhenfu Cao
Lifei Wei
Verlag: Springer International Publishing
Buch: Computer Security -- ESORICS 2015
Print ISBN: 978-3-319-24176-0

Electronic ISBN: 978-3-319-24177-7

Copyright-Jahr: 2015
DOI: https://doi.org/10.1007/978-3-319-24177-7_14

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