How to remove data from a lead Machine

The computer I saw in Company Q is basically Dell. The difference is that the chassis is closed and the drive is split. There is a steel bezel behind the chassis. All USB, serial port, parallel port, and PS/2 ports are locked inside, And the keyboard and mouse cannot be pulled out. All employees access the Internet through the HTTP proxy, and the export data is completely monitored. As long as the upstream traffic of a machine is slightly larger or the data is abnormal, someone will immediately check what you are doing.

With my evil heart, seeing such a thing will naturally lead to evil thoughts.

1. Sound Card

The sound card is also a device that can access data. As long as the plug-in of the headset and microphone is still in progress, we can even use a common audio cable to establish a TCP/IP connection between two machines. I think someone must have done this kind of thing, so I found it online and found it:

Http://www.baycom.org /~ Tom/Ham/soundmodem/

If you can establish a TCP/IP connection, you can do everything, which is a little inconvenient. Because the movement is too large, you need at least one notebook or PDA, and you need to plug in the cables.

Another option is to convert the data to be transmitted into a common audio file, which can be recorded after MP3 is connected to the sound card.

2. PC speaker

I am not sure that Q didn't remove the computer's audio interface, so although the Sound Card solution is ideal, it may not be usable. But I don't think they will be so mad at breaking down the PC speaker.

The current motherboard generally comes with PC speaker, which is actually a buzzer for a dollar. I used this kind of thing before when I was doing radio. It can send very frequent sound waves, even ultrasonic waves. PC speaker is programmable. Whether it is a direct Io operation, calling BEEP (), or even using QBASIC, it can achieve the purpose of radiating the audio modulated by files in the form of sound waves, moreover, this sonic voice cannot be heard.

The recorded data naturally contains a large amount of environmental noise. However, due to the use of ultrasound to load data, it is easy to filter out the noise.

3. keyboard lights

The keyboard lamp is also programmable. A two-line vbs script like this can control the opening of the capslock lamp:

Set wshshell = Createobject ("wscript. Shell ")
Wshshell. sendkeys "{capslock }"

You can program to convert the values 1 and 0 to the keys and lights, and then use a receiver to clear the signals and then restore them to the data.

In fact, setting up a two-dimensional dot matrix on the computer screen to transmit signals much faster than the keyboard lamp, but it is no longer concealed.

The method of flashing light is concealed, but the transmission rate is slow. In addition, some simple hardware needs to be created. (I think it should be okay to use a smartphone that can take photos)

4. Optical Drive

A general optical drive cannot burn a General disc, but can it burn a special disc? For example, a CD is made with a dye that can cause changes at a low temperature. Of course, this is just one of my ideas, and I have no test conditions.

Among the above, I think PC speaker's solution is the most ideal.

Let's brainstorm and think about some other good methods.

1. Based on the computer itself, things used are easy to obtain. Small devices like 007 are not considered.
2. Privacy, just like taking screen shots on a mobile phone.
3. Data is not transmitted over the Internet, whether encrypted or disguised.