Adaptable Ciphertext-Policy Attribute-Based Encryption
Junzuo Lai,Robert H. Deng,Yanjiang Yang,Jian Weng +3 more
- 22 Nov 2013
- Vol. 8365, pp 199-214
TL;DR: This paper introduces a new cryptographic primitive, called adaptable ciphertext-policy attribute-based encryption CP-ABE, which extends the traditional CP- ABE by allowing a semi-trusted proxy to modify a ciphertext under one access policy into ciphertexts of the same plaintext under any other access policies.
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Abstract: In this paper, we introduce a new cryptographic primitive, called adaptable ciphertext-policy attribute-based encryption CP-ABE. Adaptable CP-ABE extends the traditional CP-ABE by allowing a semi-trusted proxy to modify a ciphertext under one access policy into ciphertexts of the same plaintext under any other access policies; the proxy, however, learns nothing about the underlying plaintext. With such "adaptability" possessed by the proxy, adaptable CP-ABE has many real world applications, such as handling policy changes in CP-ABE encryption of cloud data and outsourcing of CP-ABE encryption.
Specifically, we first specify a formal model of adaptable CP-ABE; then, based on the CP-ABE scheme by Waters, we propose a concrete adaptable CP-ABE scheme and further prove its security under our security model.
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Citations
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Advances in cryptology -- EUROCRYPT 2010 : 29th Annual International Conference on the Theory and Applications of Cryptographic Techniques, French Riviera, May 30-June 3, 2010 : proceedings
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- 01 Jan 2010
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Advances in cryptology : Eurocrypt 2011 : 30th annual international conference on the theory and applications of cryptographic techniques, Tallinn, Estonia, May 15-19, 2011 : proceedings
Kenneth G. Paterson
- 01 Jan 2011
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Fuzzy encryption in cloud computation: efficient verifiable outsourced attribute-based encryption
Jing Li,Xiong Li,Licheng Wang,Debiao He,Haseeb Ahmad,Xinxin Niu +5 more
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References
Attribute-based encryption for fine-grained access control of encrypted data
Vipul Goyal,Omkant Pandey,Amit Sahai,Brent Waters +3 more
- 30 Oct 2006
TL;DR: This work develops a new cryptosystem for fine-grained sharing of encrypted data that is compatible with Hierarchical Identity-Based Encryption (HIBE), and demonstrates the applicability of the construction to sharing of audit-log information and broadcast encryption.
Ciphertext-Policy Attribute-Based Encryption
John Bethencourt,Amit Sahai,Brent Waters +2 more
- 20 May 2007
TL;DR: A system for realizing complex access control on encrypted data that is conceptually closer to traditional access control methods such as role-based access control (RBAC) and secure against collusion attacks is presented.
Fuzzy identity-based encryption
Amit Sahai,Brent Waters +1 more
- 22 May 2005
TL;DR: In this article, a new type of identity-based encryption called Fuzzy Identity-Based Encryption (IBE) was introduced, where an identity is viewed as set of descriptive attributes, and a private key for an identity can decrypt a ciphertext encrypted with an identity if and only if the identities are close to each other as measured by the set overlap distance metric.
•Posted Content
Fuzzy Identity Based Encryption.
Amit Sahai,Brent Waters +1 more
TL;DR: In this paper, a new type of identity-based encryption called Fuzzy Identity-Based Encryption (IBE) was introduced, where an identity is viewed as set of descriptive attributes, and a private key for an identity can decrypt a ciphertext encrypted with an identity if and only if the identities are close to each other as measured by the set overlap distance metric.
Ciphertext-policy attribute-based encryption: an expressive, efficient, and provably secure realization
Brent Waters
- 06 Mar 2011
TL;DR: A new methodology for realizing Ciphertext-Policy Attribute Encryption (CP-ABE) under concrete and noninteractive cryptographic assumptions in the standard model is presented.
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