一种方法是，捏造虚假身份，骗取信任并诱使你主动告知自己的账号、密码和其他信息，从而盗取你的财产或者冒用身份购物。
One way is by lying about who they are, to convince you to share your account Numbers, passwords, and other information so they can get your money or buy things in your name.
但是，一些简单的软件让咖啡店中坐在你身边的普通人也可以监视你浏览网页甚至你冒用的网上身份。
But some simple software lets just about anyone sitting next to you at your local coffee shop watch you browse the Web and even assume your identity online.
消息身份验证保证了被传输的消息不会在途中被修改，且消息创建者的身份不会被冒用。
Message authentication guarantees that a transmitted message was not modified en route and the identity of the creator is not misrepresented.
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