为了减少证书管理的开销，基于身份的公钥密码体制在基于证书的公钥密码体制诞生后出现，并且越来越受到关注。
Since the appearance of certificate-based public key systems, much attention has been paid to identity-based public key cryptosystems to decrease the cost of certificates management.
同时，基于身份加密的公钥密码系统中也存在着一些问题，如身份认证、私钥分发以及密钥托管等。
However, there are some problems in IBE such as identity authentication, private key distribution, key escrow and so on.
本文详细的陈述了安全电子邮件的各项技术，并对当前主流基于证书公钥密码体系的安全电子邮件系统进行分析，并引入了基于身份的密码系统。
This paper states all kinds of technologies on secure Email, analyses current popular secure Email system built on certificate-based public key architecture and introduces identity-based cryptosystem.
提出一个应用椭圆曲线密码体制进行密钥协商而在基于身份的公钥系统内进行组通信的全新安全组播方案。
In this paper, we propose a novel secure multicast scheme with key agreement based on Elliptic Curve Cryptosystem and group communication inside Identity-based Public key Cryptography system.
方案基于无证书的密码体制，克服了基于身份的密码体制的密钥托管问题，避免基于证书密码体制的公钥存储和管理问题。
The scheme is based on certificateless cryptosystem, so it can overcome the key escrow of ID-based cryptosystem, and avoid the public key management and storage of certificate-based cryptosys…
方案基于无证书的密码体制，克服了基于身份的密码体制的密钥托管问题，避免基于证书密码体制的公钥存储和管理问题。
The scheme is based on certificateless cryptosystem, so it can overcome the key escrow of ID-based cryptosystem, and avoid the public key management and storage of certificate-based cryptosys…
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