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Multifactor Authentication
The classic username+password authentication on to an account is only as secure as the security and complexity of the password. Passwords can be stolen or forgotten, and can place an unnecessary burden on support departments to reset passwords or to delete and recreate accounts. People are notoriously terrible at remembering complex passwords, so we tend to make them easier to remember—and easier to guess. Then we make it worse by reusing the same passwords in multiple locations.
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