Re:How to prevent eavesdropping? (Score 1)

You seem to be mistaking picture for signal. In the Ross Anderson paper on eavesdropping, he says that only the top 30% of the *frequencies* emitted are received, but never mentions the top 30% of the *picture*. He has screenshots of the captured image, and the whole picture is there. The fonts work by cutting off the high frequency information out of the horizontal.