简述密钥对生成的途径。
(1)密钥对持有者自己生成:用户自己用硬件或软件生成密钥对。 (2)密钥对由通用系统生成:由用户依赖的、可信赖的某一中心机构(如CA)生成,然后要安全地送到特定用户的设备中。
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