3 ms·
If so then this sounds like a good opportunity for blackberry to sell a secure spread-spectrum device to the government and/or military that would work on restr
by bayareaguy 18y ago
If so then this sounds like a good opportunity for blackberry to sell a secure spread-spectrum device to the government and/or military that would work on restricted frequencies. Surely Obama isn't the only political figure with a blackberry whose conversations need to be kept secure.
- cperciva 18y agoSpread spectrum doesn't help (much). Compare the signals observed on opposite sides of an electromagnetic broadcast source, and you can measure how fast it is moving without needing to know what frequency it is trying to emit.