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Key continual-leakage resilient broadcast cryptosystem from dual system in broadcast networks

Frontiers of Computer Science 2014年第3期8卷 456-468页

作者： Mingwu ZHANG Yi MU School of Computer Sciences Hubei University of Technology Wuhan 430068 China State Key Laboratory of Information Security Institute of Information Engineering Chinese Academy of Sciences Beijing 100093 China School of Computer Science and Software Engineering University of Wollongong Wollongong NSW 2522 Australia

In order to tolerate possible leakage of secret keys, leakage-resilient cryptosystem models a class of attractive leakage output by allowing an adversary to provide any computable leakage function and learning the partial keys or other possible intemal states from the output of function. In this work, we present an adaptively secure broadcast encryption resilient to key continual leakage in the standard model. Our scheme provides the tolerance of continual leakage, in which any user can generate multiple private keys per user by periodically updating the key. We use the dual system encryption mechanism to implement the leakage resilience and adaptive security, and intrinsically set an algorithm to refresh a key and produce a same distributed new key. We also give the evaluation of the leakage bound and leakage fraction, and the simulations show that our scheme can tolerate about 71% leakage fraction with 3.34× 10^-52 failure probability in standard 80-bit security level when we adjust the leakage factor to allow the private key to be 100 Kb.

关键词： broadcast encryption leakage resilience dual system encryption leakage fraction

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Encrypted data sharing with multi-owner based on digital rights management in online social networks

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The Journal of China Universities of Posts and Telecommunications 2014年第1期21卷 86-93页

作者： HUANG Qin-long FU Jing-yi MA Zhao-feng YANG Yi-xian NIU Xin-xin Information Security Center Beijing University of Posts and Telecommunications National Engineering Laboratory for Disaster Backup and Recovery Beijing University of Posts and Telecommunications Beijing National Security Science and Technology Co. Ltd

The online social networks（OSNs） offer attractive means for social interactions and data sharing, as well as raise a number of security and privacy issues. Although current solutions propose to encrypt data before sharing, the access control of encrypted data has become a challenging task. Moreover, multiple owners may enforce different access policy to the same data because of their different privacy concerns. A digital rights management（DRM） scheme is proposed for encrypted data in OSNs. In order to protect users＇ sensitive data, the scheme allows users outsource encrypted data to the OSNs service provider for sharing and customize the access policy of their data based on ciphertext-policy attribute-based encryption. Furthermore, the scheme presents a multiparty access control model based on identity-based broadcast encryption and ciphertext-policy attribute-based proxy re-encryption, which enables multiple owners, such as tagged users who appear in a single data, customize the access policy collaboratively, and also allows the disseminators update the access policy if their attributes satisfy the existing access policy. Security analysis and comparison indicate that the proposed scheme is secure and efficient.

关键词： digital rights management online social networks multi-owner attribute-based encryption broadcast encryption

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Tracing Precept against Self-Protective Tortious Decoder

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Journal of Electronic Science and Technology of China 2007年第2期5卷 115-119页

作者： Jie Tian Xin-Fang Zhang Yi-Lin Song Wei Xiang Institute of Information Sciences and Technology Huazhong University of Science and Technology Wuhan 430074 China Institute of Computing Technology Chinese Academy of Siences Beijing 100080 China Department of Electronics and Information Engineering Huazhong University of Science and Technology Wuhan 430074 China

Traceability precept is a broadcast encryption technique that content suppliers can trace malicious authorized users who leak the decryption key to an unauthorized user. To protect the data from eavesdropping, the content supplier encrypts the data and broadcast the cryptograph that only its subscribers can decrypt. However, a traitor may clone his decoder and sell the pirate decoders for profits. The traitor can modify the private key and the decryption program inside the pirate decoder to avoid divulging his identity. Furthermore, some traitors may fabricate a new legal private key together that cannot be traced to the creators. So in this paper, a renewed precept is proposed to achieve both revocation at a different level of capacity in each distribution and black-box tracing against self-protective pirate decoders. The rigorous mathematical deduction shows that our algorithm possess security property.

关键词： Attack prevention broadcast encryption Diffie-Hellman problem malicious subscriber,tracing algorithm.

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