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Restricted adaptive oblivious transfer was introduced by Herranz in 2011, which is the main approach to protect user privacy in e-transactions involving operations on digital confidential data or sensitive information. There are many practical applications for restricted adaptive oblivious transfer, such as medical or financial data access, pay-per-view TV, and so on. However, so far as the people know, there are only two protocols for restricted adaptive oblivious transfers which were both proposed by Herranz. Furthermore, these two protocols are very expensive. In this paper, the authors propose a new protocol for restricted adaptive oblivious transfer by using fully homomorphic encryption.
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