New computer virus secretly leaks data through air

什么是惡意軟件？惡意軟件本身可能是一種病毒，它通過動態地改變，從而攻擊代碼，逃避入侵檢測系統的特征檢測。攻擊者常常利用這種多變代碼，進入網上帶有入侵偵測的系統。想要電腦一直保持較高的安全性嗎？看看這是如何操作的！

Security researchers have developed malware that can capture keystrokes from a computer and hijack the soundcard to broadcast the data to a nearby machine as a high-frequency sound which cannot be heard by humans.

In extremely high-security environments it is common practice to create an \"air gap\" between PCs containing sensitive information and others which are connected to the Internet， in order to prevent remote malicious attacks. This research proves that it would be possible to use computer speakers and microphones to bridge this gap and send sensitive information back to a remote attacker， which authors warned was a \"considerable threat to computer security\".

Speakers and microphones are often overlooked in security planning， and by using frequencies outside the range of human hearing， it is likely that such messages could escape detection even when they are beamed across an office full of staff.

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