A replay attack is a form of network attack in which valid data transmission is maliciously or fraudulently repeated or delayed. This is carried out either by the originator or by an adversary who intercepts the data and re-transmits it, possibly as part of a spoofing attack by IP packet substitution.

What is replay attack example?

One example of a replay attack is to replay the message sent to a network by an attacker, which was earlier sent by an authorized user. ... A replay attack can gain access to the resources by replaying an authentication message and can confuse the destination host.

What is replay attack and how does it work?

A replay attack occurs when a cybercriminal eavesdrops on a secure network communication, intercepts it, and then fraudulently delays or resends it to misdirect the receiver into doing what the hacker wants.