Imagine that you want to send a secret message to your colleague at the CIA. You can encrypt it to prevent counterspies from reading it. But they'll still know you were sending some sort of message. There's a better option—steganography—which means "hidden writing." You tuck your secret away in an unexpected place, like an MP3 or a photo file, to conceal the fact you even shared any information at all。

　　假設(shè)你要給中情局的同事發(fā)送一封密函，為了不讓間諜竊取情報，你可以給文件加密。但是那些間諜還是會知道你在傳送文件。別急，隱寫術(shù)可以幫上忙。隱寫術(shù)也就是“文字隱藏”。你可以將秘密文字信息隱藏在MP3或者圖片格式文檔下，于是你就可以瞞天過海了。

( 責(zé)任編輯:廣東招生考試信息網(wǎng))

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