If there is a change in how the user accesses their account, like from a new device or geographical location, further security checks are required. This often also generates a notification through a different channel. For example, when someone logs into their email from a new device, they are sent a message notifying them of this change.
- Logins from different devices are recorded, so the user can review and revoke access that doesn’t look right
- The user is notified if the account has been compromised
- Reassures the user the security of their account is being protected
- If it’s a service that the user accesses often, they might be overwhelmed if they receive a notification each time
- The user may miss notifications if multiple accounts are compromised
- Unusual activity can only be detected by collecting data about “usual activity” - this can include personally identifiable data such as machine IDs or IP addresses.
Facebook requires people to answer security questions or sign in again if they're accessing services from a new location
Many online banking services require further authentication when transferring money to a new account
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