Mastering Blockchain Programming with Solidity

Replay attack

This is a type of attack in which an attacker is allowed to recall the function of the contract, allowing them to update the state variables. Using these attacks, an attacker can update the state variables or perform some unintended operations multiple times when they should not be allowed. The signature replay attacks are mostly prone to replay attacks. You should ensure that signatures are handled correctly in contracts. Let's discuss the signature replay attack.