On Sat, 23 Mar 2002, Toni Heinonen wrote: > > How susceptible are various wireless networking implementations to > > jamming (as a means to a DoS)? While several pages of well written technical fantasy may work for marketing, it's generally not a good idea to try feed fluff to engineering types. Let's cut to the chase.. > Executive summary: <snip> > With bluetooth, you also have to simply jam on a very wide band (you > need a very advanced and smart jamming device) or you can have a very > smart jamming device that jams on the right frequencies on any given > time. A jamming device need not be smart or sophisticated. Choose an inverter IC with the appropriate timings, loop 3 inverters in series to generate a nice noisy signal on your base frequency. Since it's a square wave, you'll have lots of useful sidebands and harmonics. Tuning impedances can selectively create a lot of noise across multiple wide bands. Since spreading the noise across more bandwidth decreases the effective power, an output transistor may need to be added. Swamp the emitter until it's clipping the signal and producing more power on more frequencies. Add transistor stages as needed, since each costs about $1. Just as the Law of Gravity assures us that it will always be easier to bring things down than it is to put them up, the Second Law of Thermodynamics assures us that it will always be easier to create chaos than to create order. It will always be cheaper to DoS a wireless network than it is to build it. There will always be a greater financial incentive to create marketing hyperbole than to rebut it.
This archive was generated by hypermail 2b30 : Sun Mar 24 2002 - 19:23:15 PST