What does "Intercept-Resend Attacks" mean?

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Intercept-resend attacks are a type of security threat in communication systems, particularly in quantum key distribution. In this attack, a malicious person, often called an eavesdropper, tries to sneak into the communication between two parties.

The eavesdropper listens to the information being sent and intercepts it. After capturing the data, the attacker then sends their version of the message to the intended receiver. This way, the receiver thinks they are communicating safely with the original sender, while in reality, they are communicating with the eavesdropper.

These attacks can create serious security issues because the eavesdropper can manipulate the information or steal sensitive data without the knowledge of the original parties. To defend against such threats, systems need to have strong detection methods that can identify when an eavesdropper is present.

The goal is to ensure that only the intended participants can access and understand the shared information, keeping it safe from unwanted eyes.