Journal
MULTIMEDIA TOOLS AND APPLICATIONS
Volume 77, Issue 9, Pages 10455-10469Publisher
SPRINGER
DOI: 10.1007/s11042-017-4448-9
Keywords
Proxy re-encryption; Automatically re-encryption; Proxy broadcast re-encryption; Chosen-ciphertext secure
Categories
Funding
- National Natural Science Foundation of China [61672270, 61602216, 6127208, 61300236]
- Research Foundation for Humanities and Social Sciences of Ministry of Education, China [14YJAZH023, 15YJCZH129]
- Qing Lan Project for Young Researchers of Jiangsu Province of China [KYQ14004]
- Open Fund of State Key Laboratory of Information Security, Institute of Information Engineering, Chinese Academy of Sciences [2015-MSB-10]
- National Science Foundation for Post-doctoral Scientists of China [2013M530254]
- National Science Foundation for Post-doctoral Scientists of Jiangsu [1302137C]
- China Postdoctoral Science special Foundation [2014T70518]
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Proxy re-encryption (PRE) enables a semi-trusted proxy to automatically convert a delegator's ciphertext to a delegate's ciphertext without learning anything about the underlying plaintext. PRE schemes have broad applications, such as cloud data sharing systems, distributed file systems, email forward systems and DRM systems. In this paper, we introduced a new notion of proxy broadcast re-encryption (PBRE). In a PBRE scheme, a delegator, Alice, can delegate the decryption right to a set of users at a time, which means that Alice's ciphertext can be broadcast re-encrypted. We propose a PBRE scheme and prove its security against a chosen-ciphertext attack (CCA) in the random oracle model under the decisional n-BDHE assumption. Furthermore, our scheme is collusion-resistant, which means the proxy cannot collude with a set of delegates to reveal the delegator's private key.
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