Token replay is the reuse of a captured authentication token to impersonate a legitimate user or service. It matters because attackers may not need to break authentication if they can simply reuse trusted artifacts.
What is Token Replay?
In a token replay attack, the adversary captures a valid token and presents it again to a service that accepts it as legitimate. The success of replay depends on the token type, expiration, binding controls, and whether the system can detect abnormal use.
What Token Replay Commonly Targets
Common targets include session cookies, API bearer tokens, cloud access tokens, and other reusable credentials that are not strongly bound to the original device, process, or context.
Token Replay vs. Token Theft
Token theft is the act of stealing the token. Token replay is the act of using that token to gain unauthorized access.
Frequently Asked Questions
Why is token replay important to understand?
Because many systems trust bearer artifacts too broadly once issued.
How can replay risk be reduced?
By shortening token lifetime, using binding or proof mechanisms where possible, monitoring anomalies, and revoking suspicious sessions quickly.
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