Interception;  Monitoring;  Wiretapping

 Man-in-the-Middle

Eavesdropping is the surreptitious monitoring of communication.

Eavesdropping has two underlying goals. Primarily, it seeks to monitor communication with high information fidelity. The intercepted communication should closely reflect the information that the sender is attempting to convey to the receiver. Additionally, eavesdropping should be a clandestine operation; neither the sender nor the receiver should be aware of the eavesdropper’s presence.

Eavesdropping can be classified into two techniques. In passive eavesdropping, the eavesdropper monitors communication and does not interfere with the communication channel. Passive eavesdroppers are difficult to detect since their presence does not produce any observable effects. In contrast, active eavesdroppingtechniques permit the eavesdropper to both observe the communication medium as well as modify its contents. In...