Cost-Effective Authentic and Anonymous Data Sharing with Forward Security - 2015
Data sharing has never been easier with the advances of cloud computing, and an accurate analysis on the shared data provides an array of advantages to each the society and individuals. Information sharing with a giant variety of participants should take into account many problems, including efficiency, information integrity and privacy of data owner. Ring signature could be a promising candidate to construct an anonymous and authentic data sharing system. It permits a information owner to anonymously authenticate his knowledge that will be put into the cloud for storage or analysis purpose. Yet the pricey certificate verification in the ancient public key infrastructure (PKI) setting becomes a bottleneck for this resolution to be scalable. Identity-primarily based (ID-primarily based) ring signature, that eliminates the process of certificate verification, can be used instead. During this paper, we tend to more enhance the security of ID-primarily based ring signature by providing forward security: If a secret key of any user has been compromised, all previous generated signatures that include this user still remain valid. This property is especially vital to any large scale knowledge sharing system, as it's impossible to raise all data homeowners to reauthenticate their data even if a secret key of 1 single user has been compromised. We give a concrete and economical instantiation of our scheme, prove its security and give an implementation to indicate its practicality.
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