发送方根据消息的内容创建消息摘要（也称为哈希码、指纹或者水印）。
The sender creates a message digest (also called hash value, fingerprint/thumbprint, or watermark) based on the contents of the message.
发送方用自己的私钥加密消息摘要。
The sender encrypts the message digest under her private key.
这个过程包括发送方生成消息摘要，然后用其私钥对摘要加密以创建数字签名。
The process involves the sender generating the message digest, then encrypting the digest using its private key to create the digital signature.
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