Identity-Based Proxy Re-encryption Without Random Oracles
Identity-Based Proxy Re-encryption Without Random Oracles
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DOI：
10.1007/978-3-540-75496-1_13
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发表时间：
2007-10
期刊：
影响因子：
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通讯作者：
Cheng-Kang Chu;Wen-Guey Tzeng
中科院分区：
文献类型：
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作者：
Cheng-Kang Chu;Wen-Guey Tzeng
代理重新加密方案允许Alice通过代理临时将解密权委托给Bob。Alice给代理一个重新加密密钥，这样代理就可以将Alice的密文转换为Bob的密文。在本文中，我们提出了两个基于身份的代理重加密方案，这两个方案都被证明是安全的标准模型。第一种方案在计算量和密文长度上都是有效的，第二种方案实现了选择密文安全性。我们的解决方案回答了以前工作中遗留的开放问题。
A proxy re-encryption scheme allows Alice to temporarily delegate the decryption rights to Bob via a proxy. Alice gives the proxy a re-encryption key so that the proxy can convert a ciphertext for Alice into the ciphertext for Bob. In this paper, we propose two identity-based proxy re-encryption schemes, which are both proved secure in the standard model. The first one is efficient in both computation and ciphertext length, and the other one achieves chosen-ciphertext security. Our solutions answer the open problems left in the previous work.