期刊名称：International Journal of Computer Trends and Technology
电子版ISSN：2231-2803
出版年度：2014
卷号：16
期号：4
页码：141-144
出版社：Seventh Sense Research Group
摘要：With the recent assumption and diffusion of data sharing paradigm in distributed systems such as cloud computing or online social networks, there have been increasing concerns and demands for distributed data security. The support of policies updates and enforcement of access policies is one of the most challenging issues in data sharing systems. Cipher text policy attributebased encryption i.e. CPABE is becoming a challenging cryptographic solution to this issue has been enables for the data owners and to define their own data access policies over the user attributes and impose the policies on the data to be distributed. Nevertheless, the advantage comes with a big drawback which is known as the key escrow problem. Key generation center i.e KGC could decrypt any message addressed to specific user by generating their private keys. This is not suitable for the data sharing cases where data owner would like to make their private data only accessible to designated users. Furthermore, applying CPABE . Cipher text policy attributebased encryption in data sharing system introduces another issue with regard to the user revocation since access policies are defined only over the attribute universe
关键词：attribute-based encryption; revocation; removing escrow; Data sharing
