新模型下多授权中心的基于分级身份的密码系统

摘要

提出一个多授权中心的基于分级身份的密码系统，包括分级的基于身份的加密和签名方案．文章的贡献包括：在各个授权层级上都具有多个授权中心，从而新方案提高了基于身份的密码系统的健壮性；新方案在标准模型中是可证明安全的．%A new hierarchical identity based （ID-based） cryptosystem is proposed, including hierarchical ID- based encryption and signature. Contributions are many folds： First, there are muhiple private key generators in the new scheme; second, it is provably secure and has tight security in the standard model.