Abstract
Since the proxy re-encryption has the limitation of distributed applications and the security risk of collusion attacks in semi-trusted distributed environments (e.g. cloud computing), the novel definition of threshold proxy re-encryption is proposed based on secret sharing and proxy re-encryption. According to the definition, the threshold proxy re-encryption scheme can be flexibly created with the standard cryptographic prototype. An efficient, secure, and implementable unidirectional threshold proxy re-encryption scheme is constructed by the combination of Shamir’s secret sharing, and is proved secure by using the intractability of discrete logarithms. This paper presents a consortium blockchain access permission scheme, which is built on the threshold proxy re-encryption scheme. When a new node joins a consortium blockchain, an access permission is achieved by the agreement on other existing nodes, instead of a centralized CA.
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Acknowledgments
We appreciate all helpful comments given by the reviewers. This research has been supported by Beijing Natural Science Foundation (Grant No. 4132057), the National Natural Science Foundation of China (Grant No. 61472032, No. 61572132; U1705264), Guangxi Key Laboratory of Cryptography and Information Security (No. GCIS201609), and Fujian Provincial Key Laboratory of Network Security and Cryptology Research Fund (Fujian Normal University) (No. 15007).
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Chen, X., Liu, Y., Li, Y., Lin, C. (2018). Threshold Proxy Re-encryption and Its Application in Blockchain. In: Sun, X., Pan, Z., Bertino, E. (eds) Cloud Computing and Security. ICCCS 2018. Lecture Notes in Computer Science(), vol 11066. Springer, Cham. https://doi.org/10.1007/978-3-030-00015-8_2
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DOI: https://doi.org/10.1007/978-3-030-00015-8_2
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