The sender creates a message digest (also called hash value, fingerprint/thumbprint, or watermark) based on the contents of the message.
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）。
MD5 message digest algorithm is a use - widely algorithm for abstracting digital fingerprint.
MD 5报文摘要算法是一种应用广泛的提取数字指纹的算法。
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