What Is A Replay Attack, And How Is It Different from Idempotency Issues?

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What Is A Replay Attack, And How Is It Different from Idempotency Issues?

A replay attack is a type of cyberattack where an attacker intercepts a valid data transmission and maliciously reuses (repeats or delays) it to fraudulently repeat an action or gain unauthorized access.

In other words, the attacker “plays back” a previously sent message (such as a login token or a payment request) to trick a system into thinking it’s a new, legitimate request.

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