网关必须有一个公有、私有密匙对以及签名的证书。
The gateway must have a public-private key pair and a signed certificate.
这种安排的两个优点就是允许对表单使用多步骤签名，以及签名之间可以彼此重叠。
Two benefits of such an arrangement are that multiple signatures are allowed in a form and that signatures can overlap each other.
签名过程分为四个阶段：系统初始化、生成个体签名、生成群签名以及签名验证。
The signature process included four phases: system initialization, individual signature generation, group signature generation and signature verification.
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