A Fully Secure Unidirectional and Multi-use Proxy Re-encryption Scheme
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چکیده
In a proxy re-encryption scheme, a ciphertext for Alice can be converted into a ciphertext for Bob with the help of a semi-trusted proxy, while the proxy gets no information about the messages encrypted under either key during the conversion. Proxy re-encryption has become more and more popular these years due to its practical applications. In this paper, we propose a fully secure proxy re-encryption scheme with several useful properties, namely, unidirectionality, multi-use, collusion-safe, non-interactivity, and nontransitivity. Our scheme solves one of the six open problems presented by Canetti and Hohenberger at ACM CCS 2007.
منابع مشابه
Improving the Security of an Efficient Unidirectional Proxy Re-Encryption Scheme
A proxy re-encryption (PRE) scheme allows a designated proxy, that has beforehand received a so-called re-encryption key, to translate a ciphertext intended to one user to a ciphertext intended to another one. Traditionally, the re-encryption key is generated at the initiative of the initial receiver and ideally, no secret keys should be known to the proxy. Such scheme is said unidirectional if...
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تاریخ انتشار 2009