In addition, a Faraday cage can prevent the escape of the EM fields emitted by a cathode-ray-tube (CRT) computer monitor. Such fields can be intercepted and translated to allow hackers to remotely view on-screen data in real time without the need for wires, cables, or cameras. This practice, known as van Eck phreaking, can also be used by government officials to view the computer activities of known criminals and certain criminal suspects.
is this for real? van Eck phreaking:using crt EM fields to recreate screen
- Thread starter iwantanewcomputer
- Start date
It is true.
I did some contract work for the pentagon way back. The entire place is blanketed with EM noise to prevent this activity.
I did some contract work for the pentagon way back. The entire place is blanketed with EM noise to prevent this activity.
hi spidey07, i work for the department of defense. thank you fo letting me know that you are a possible terrorist giving away confidential information. Our agents will be visiting you shortly.
Yes it's real, it's called TEMPEST. Google it.
They got pissed when we could still reconstruct the images too.
They got pissed when we could still reconstruct the images too.
The method is mentioned in passing in The Fool's Run (fiction, not particularly technical).
I like the method of recording ambient light changes. Since a CRT's pixel phosphors are discrete, the rapid pulsing as the electron beam sweeps the screen (invisible to the human eye) can be converted into grayscale intensity, then rearranged to match the victim screen. Countermeasure: turn room lights on or use an LCD (updates a line at a time). I've forgotten what the method was called.
I like the method of recording ambient light changes. Since a CRT's pixel phosphors are discrete, the rapid pulsing as the electron beam sweeps the screen (invisible to the human eye) can be converted into grayscale intensity, then rearranged to match the victim screen. Countermeasure: turn room lights on or use an LCD (updates a line at a time). I've forgotten what the method was called.
Oh there's lots of ways to snoop. Have a outside window? Yep, can bounce a laser off that and capture sound in the room with sufficient fidelity to understand a conversation.
Your hard disk activity lights, cable modem activity lights, etc. can be scanned as well. Be afraid, very afraid. Better buy lots of reynold's and scotch 33 lectric tape to cover those LED's.
Your hard disk activity lights, cable modem activity lights, etc. can be scanned as well. Be afraid, very afraid. Better buy lots of reynold's and scotch 33 lectric tape to cover those LED's.
Originally posted by: sharkeeper
Oh there's lots of ways to snoop. Have a outside window? Yep, can bounce a laser off that and capture sound in the room with sufficient fidelity to understand a conversation.
Your hard disk activity lights, cable modem activity lights, etc. can be scanned as well. Be afraid, very afraid. Better buy lots of reynold's and scotch 33 lectric tape to cover those LED's.
Can you name more?
Have at it.
I don't have tinfoil hat, but I have seen some freaky EM in the pentagon. I got too close one time and proposed "your EM radiation is the cause of your problems." I was told that is just how it is and to work around the problem.
Originally posted by: PCboy
Originally posted by: sharkeeper
Oh there's lots of ways to snoop. Have a outside window? Yep, can bounce a laser off that and capture sound in the room with sufficient fidelity to understand a conversation.
Your hard disk activity lights, cable modem activity lights, etc. can be scanned as well. Be afraid, very afraid. Better buy lots of reynold's and scotch 33 lectric tape to cover those LED's.
Can you name more?
Why bother. Anything your computer send and request over the net if open to anyone. Even encryption will break over time.
The biggest enjoyment in life is doing things everyday that everyone else says (or thinks) cannot be done.
Originally posted by: OulOat
Originally posted by: PCboy
Originally posted by: sharkeeper
Oh there's lots of ways to snoop. Have a outside window? Yep, can bounce a laser off that and capture sound in the room with sufficient fidelity to understand a conversation.
Your hard disk activity lights, cable modem activity lights, etc. can be scanned as well. Be afraid, very afraid. Better buy lots of reynold's and scotch 33 lectric tape to cover those LED's.
Can you name more?
Why bother. Anything your computer send and request over the net if open to anyone. Even encryption will break over time.
Good modern encryption is solid until quantum computers are built.
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