Attribute-Based Re-Encryption Scheme in the Standard Model

摘要

In this paper,we propose a new attribute-based proxy re-encryption scheme,where a semi-trusted proxy,with some additional information,can transform a ciphertext under a set of attributes into a new ciphertext under another set of attributes on the same message,but not vice versa,furthermore,its security was proved in the standard model based on decisional bilinear Dif-fie-Hellman assumption. This scheme can be used to realize fine-grained selectively sharing of encrypted data,but the general proxy re-encryption scheme severely can not do it,so the proposed scheme can be thought as an improvement of general traditional proxy re-encryption scheme.