Verifiable outsourced ciphertext-policy attribute-based encryption in cloud computing
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In the attribute-based encryption (ABE) systems, users can encrypt and decrypt messages based on their attributes. Because of the flexibility of ABE, it is more and more widely used in various network environments. However, complex functionality of ABE may cause an enormous computational cost. This reason greatly restricts the application of ABE in practice. In order to minimize the local computation of ABE, we introduce the concept of verifiable outsourced ABE system, in which key generation center, encryptor and decryptor, are able to outsource their computing tasks to the corresponding service providers, respectively, to reduce the local load. In addition, they are also able to verify the correctness of outsourcing calculation efficiently by using the outsourcing verification services. This is useful to save local computational resources, especially for mobile devices. Then, we propose a specific verifiable outsourced ABE scheme and prove its adaptive security in the standard model using the dual-system encryption method. Finally, we introduce how to deploy our outsourced CP-ABE scheme in cloud computing environment.
KeywordsCP-ABE Outsourcing Verifiable Cloud computing Adaptively secure
This study was funded by the National Natural Science Foundation of China (Grant Numbers 61173139, 61272434, 61502218, 61572294, 61572379), the Natural Science Foundation of Shandong Province (Grant Number ZR2013FQ021), Outstanding Young Scientists Foundation Grant of Shandong Province (Grant Number BS2014DX016), the CICAEET fund, the PAPD fund and the Natural Science Foundation of Hubei Province of China (Grant Number 2015CFB257).
Compliance with ethical standards
Conflict of interest
The authors declare that they have no conflict of interest.
This article does not contain any studies with human participants or animals performed by any of the authors.
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