作为环签名基础的公钥加密体制，存在着密钥泄露的问题，对于环签名的安全性来说是致命的。
It is a crux for security of ring signature that exposure of secret keys can be a devastating attack on cryptosystem which ring signature base on.
而环签名具有运算效率高、匿名性强的特点，利用无证书公钥系统可解决密钥管理问题。
Ring signature has high computational efficiency and strong anonymity, so the the key management can be solved by using the certificateless public key system.
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