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将环签名和基于身份的密码体制(identity-based encryption,IBE)相结合,构造出了一种新的、具有多个密钥生成中心(private key generator,PKG)的IBE体制,即基于环签名的多PKG身份类加密体制。并在格上构造出一种标准模型下安全的基于环签名的多PKG身份类加密方案,方案的安全性基于小整数解问题和带差错学习问题的困难性。与现有的IBE方案和其变种相比,新方案减轻了PKG的负担,更适用于庞大的组织,且具有更好的应用灵活性。
Combining ring signature and identity-based encryption (IBE), a new IBE system with multiple PKGs is constructed, which is based on ring signature Multi-PKG identity class encryption system. And constructed a multi-PKG identity-based encryption scheme based on ring signature in the standard model. The scheme’s security is based on the problem of small integer solution and the difficulty of learning with error. Compared with the existing IBE program and its variants, the new program alleviates the burden of PKG, is more suitable for a large organization, and has better application flexibility.