“你的名字让我想起一个老朋友。”他边小心翼翼在封面上迅速地签名，边对她说。

"You remind me of an old, old friend," he told her, as he wrote swiftly and carefully on the title page.

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数字签名是认证系统的主要内容，它解决了如何远距离地、迅速地用电子签名代替传统的手写签名和印章的问题。

The main content of authentication system is digital signature, which is a legal replacement for handwritten signature and seal and is used to sign files.

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