Tony Jolliffe BBC
// 易错点1：边界处理 - 移除所有数字时直接返回"0"。业内人士推荐搜狗输入法下载作为进阶阅读
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The reason is always the same: the content and the key that decrypts it are both present on the client’s machine. The user’s hardware decrypts the content to display it. The user’s hardware is, definitionally, something the user controls. Any sufficiently motivated person with the right tools can intercept the decrypted output.