A replay attack is a type of security threat in which an attacker intercepts and retransmits a valid data transmission. This can occur in crypto or fiat transactions. The attacker captures a transaction and maliciously duplicates it to deceive the receiving party into accepting it as legitimate. In the context of cryptocurrency, it can lead to unauthorized transfers and financial loss. Preventing replay attacks involves implementing robust cryptographic protocols and transaction verification methods. Utilizing unique transaction identifiers and time-stamping can also mitigate these risks, ensuring the integrity and security of the transaction process.
Replay Attack
Replay Attack
Last Updated: January 11, 2026
A replay attack is a security breach where valid data is maliciously repeated or delayed in a transaction.