PKI是一种公共密钥证书标准，它提供了一种安全的网上支付方式。
PKI is a proposed standard for public-key certificates, which can provide the safe payment way.
通过对一个标准模型下可证安全的无证书签名方案进行分析，指出该方案是不安全的。
A certificateless signature scheme provably secure in the standard model is analyzed. It points out that the scheme is insecure.
公司获得了国家危险化学品从业单位安全标准化二级企业证书；同时正在办理产品安全生产许可证；
The company has gained the security certificate of national dangerous chemicals business unit standardization for the secondary unit, and also safety production license;
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