A Man-in-the-Middle attack is a cyber-attack where an intruder injects themselves in the middle of the communication between two parties. The intruder pretends to be both parties. Let us imagine that John is talking to Mary over the phone. Frank listens in by capturing John’s side of the conversation then forwarding it to Mary. He also captures Mary’s side of the conversation and forwards it to John. Mary mistakes Frank for John, while John mistakes Frank for Mary. Frank is the Man-in-the-Middle.

A Man-in-the-Middle attack is a cyber-attack where an intruder injects themselves in the middle of the communication between two parties. The intruder pretends to be both parties. Let us imagine that John is talking to Mary over the phone. Frank listens in by capturing John’s side of the conversation then forwarding it to Mary. He also captures Mary’s side of the conversation and forwards it to John. Mary mistakes Frank for John, while John mistakes Frank for Mary. Frank is the Man-in-the-Middle.