简述数字签名应满足的要求。
(1)接收方B能够确认或证实发送方A的签名,但不能由B或第三方C伪造;(2)发送方A发出签名的消息给接收方B后,A就不能再否认自己所签发的消息;(3)接收方B对已收到的签名消息不能否认,即有收报认证;(4)第三者C可以确认收发双方之间的消息传送,但不能伪造这一过程。
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