Identity-Based Hierarchical Strongly Key-Insulated Encryption and Its Application
Identity-Based Hierarchical Strongly Key-Insulated Encryption and Its Application
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DOI：
10.1007/11593447_27
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发表时间：
2005-12
期刊：
影响因子：
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通讯作者：
Y. Hanaoka;Goichiro Hanaoka;Junji Shikata;H. Imai
中科院分区：
文献类型：
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作者：
Y. Hanaoka;Goichiro Hanaoka;Junji Shikata;H. Imai
讨论了基于身份的加密(IBE)中解密密钥的非交互更新问题。在实践中，密钥撤销是一个必要和不可避免的过程，国际教育局也不例外，因为它必须管理解密密钥的撤销，而不会失去其在效率上的优点。本文的主要贡献是提出了新的IBE结构，其中解密密钥可以在不改变其公钥即用户身份的情况下被更新。我们通过扩展分层IBE(HIBE)来实现这一点。在安全性方面，针对模拟随机预言模型中所有可能类型的密钥暴露的非常强的攻击环境，我们解决了针对自适应选择密文攻击的语义安全。此外，我们还给出了在随机预言模型中利用任意IBE构造部分抗合谋的HIBE的方法。通过结合这两个结果，我们可以仅从任意的IBE构造具有非交互密钥更新的IBE。
In this paper, we discuss non-interactive updating of decryption keys in identity-based encryption (IBE). In practice, key revocation is a necessary and inevitable process and IBE is no exception when it comes to having to manage revocation of decryption keys without losing its merits in efficiency. Our main contribution of this paper is to propose novel constructions of IBE where a decryption key can be renewed without having to make changes to its public key, i.e. user’s identity. We achieve this by extending the hierarchical IBE (HIBE). Regarding security, we address semantic security against adaptive chosen ciphertext attacks for a very strong attack environment that models all possible types of key exposures in the random oracle model. In addition to this, we show method of constructing a partially collusion resistant HIBE from arbitrary IBE in the random oracle model. By combining both results, we can construct an IBE with non-interactive key update from only an arbitrary IBE.