Eavesdropping is the act of surreptitiously listening to a private conversation, typically between hosts on a network. For instance, programs such as Carnivore and NarusInsight have been used by the FBI and NSA to eavesdrop on the systems of internet service providers. Even machines that operate as a closed system (i.e., with no contact to the outside world) can be eavesdropped upon via monitoring the faint electro-magnetic transmissions generated by the hardware; TEMPEST is a specification by the NSA referring to these attacks.
ইন্টারনেট সার্ভিস প্রোভাইডারদের সিস্টেমে আড়ি পেতে শোনার জন্য কে কার্নিভোর এবং নারুস ইনসাইট এর মতো প্রোগ্রাম ব্যবহার করেছে?
the FBI and NSA