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| 1 | Cryptanalysis and Improvement of a New Certificateless Signature Scheme in the Standard Model显示文摘Digital signature,as an important cryptographic primitive,has been widely used in many application scenarios,such as e-commerce,authentication,cloud computing,and so on.Certificateless Public Key Cryptography(PKC)can get rid of the certificate management problem in the traditional Public Key Infrastructure(PKI)and eliminate the key-escrow problem in the identity-based PKC.Lately,a new Certificateless Signature(CLS)scheme has been proposed by Kyung-Ah Shim(IEEE SYSTEMS JOURNAL,2018,13(2)),which claimed to achieve provable security in the standard model.Unfortunately,we present a concrete attack to demonstrate that the scheme cannot defend against the Type I adversary.In this type of attack,the adversary can replace the public key of the signer,and then he plays the role of the signer to forge a legal certificateless signature on any message.Furthermore,we give an improved CLS scheme to resist such an attack.In terms of the efficiency and the signature length,the improved CLS is preferable to the original scheme and some recently proposed CLS schemes in the case of precomputation. | Chenhuang Wu Hui Huang Kun Zhou Chunxiang Xu | 2021 | China Communications2021，18，1： | 1 |
| 2 | A Practical Group Key Management Algorithm for Cloud Data Sharing with Dynamic Group显示文摘Cloud data sharing service, which allows a group of people to work together to access and modify the shared data, is one of the most popular and efficient working styles in the enterprises. However, the cloud server is not completely trusted, and its security could be compromised by monetary reasons or caused by hacking and hardware errors. Therefore, despite of having advantages of scalability and flexibility, cloud storage service comes with privacy and the security concerns. A straightforward method to protect the user's privacy is to encrypt the data stored at the cloud. To enable the authenticated users to access the encrypted cloud data, a practical group key management algorithm for the cloud data sharing application is highly desired. The existing group key management mechanisms presume that the server is trusted. But, the cloud data service mode does not always meet this condition. How to manage the group keys to support the scenario of the cloud storage with a semi-trusted cloud server is still a challenging task. Moreover, the cloud storage system is a large-scale and open application, in which the user group is dynamic. To address this problem, we propose a practical group key management algorithm based on a proxy re-encryption mechanism in this paper. We use the cloud server to act as a proxy tore-encrypt the group key to allow authorized users to decrypt and get the group key by their private key. To achieve the hierarchical access control policy, our scheme enables the cloud server to convert the encrypted group key of the lower group to the upper group. The numerical analysis and experimental results further validate the high efficiency and security of the proposed scheme. | Wei Song Hua Zou Haowen Liu Jun Chen | 2016 | China Communications2016，13，6： | 0 |
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