无证书公钥密码体制解决了密钥托管问题和公钥认证问题。

Certificateless public key cryptography resolves the key escrow problem and public key authentication problem.

youdao

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.

youdao

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…

youdao