I recently stumbled on descriptions of the 'QuantumInsert' attack (mainly used by the TAO group from NSA). This technique seems to be massively used to perform man-in-the-middle or man-on-the-side attacks to insert viruses on specifically targeted computer systems.
Now, I would like to know more about the limits of this technique. I read it that only NSA could get access to this kind of attacks, but could other governments, or big companies master this technique too ?
And, finally, I would like to know if there are some ways to protect your web access from this attack (at an individual level) ?
Edit: Just a good explanation from the 30C3 (Dec 2013) in this talk.