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In order to achieve fine-grained access control in cloud computing, existing digital rights management (DRM) schemes adopt attribute-based encryption as the main encryption primitive. However, these schemes suffer from inefficiency and cannot support dynamic updating of usage rights stored in the cloud. In this paper, we propose a novel DRM scheme with secure key management and dynamic usage control...
Spam over Internet Telephony (SPIT) has become a serious issue for VoIP applications. SPIT detection is gaining huge focus in recent years. In this paper, we analyzed SPIT calls encoded using VBR method with the feature of bulk repeated. The chi-square test is used to intuitively verify the similarity among the lengths of VoIP packets which are with the characteristic of bulk repeated. In addition...
There has been increasing concern about Databaseas-a-Service(DAS) architectures. In the DAS model, the conventional scheme for query over encrypted data in database is to construct efficient index in database. This can ensure query efficiency. However, the fuzzy search is often used in the query of character data. It will be very tough owing to data encryption. Even the tiny changes of plaintext,...
Since the concept of proxy signature was introduced in 1996, many variants of proxy signature schemes have been proposed. Among of them, the requirement of proxy signer's privacy protection and the revocation of proxy signer's anonymous identity are needful in some practical applications. Recently, Hu et.al gave a new type of proxy ring signature scheme with revocable anonymity, it allows the original...
Internet censorship is on the rise as an increasing number of countries and companies block or monitor access to parts of the Internet. Many censorship resistant systems have been proposed, which rely on deploying many access points to the censored domain. Therefore they face the problem of discovering available nodes and deploying a large number of nodes. Opposite to many access point approach, we...
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