Impossible travel is a scenario where a user appears to log in from two geographically distant locations within a time frame that makes it physically impossible to travel between them. This is a strong indicator of a potentially compromised account, as it suggests unauthorized access. Abnormal account activity and unexpected outbound communication could also indicate issues but are not as clear-cut or reliable as impossible travel.
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What is impossible travel in the context of compromised accounts?
How do security systems detect impossible travel?
Why are abnormal account activity and unexpected outbound communication less reliable than impossible travel?