Authentication tokens are credentials issued after successful authentication to allow continued access without re-entering credentials. Token expiration limits how long a token remains valid, reducing the risk of misuse if a token is compromised.
Token expiration policies define validity duration based on security requirements and usability considerations. Short-lived tokens provide stronger security but may require frequent re-authentication. Long-lived tokens improve usability but increase risk exposure.
Systems must handle token expiration gracefully by prompting users to re-authenticate or automatically refreshing tokens when supported. Backend services validate token timestamps and reject expired tokens to prevent unauthorized access.
Improper token expiration handling can cause session disruptions or security vulnerabilities. Monitoring token usage and expiration failures helps identify misconfigurations and improve authentication reliability.
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