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The Economist explains: How can Twitter reveal your personality?
The Economist explains: How do two-factor logins improve security? Two-factor authentication relies on a combination of two separate credentials. One is typically a standard password. The other is a one-time passcode, often sent to a mobile phone. The method by which the code is delivered is "out of band" and cannot be intercepted by the attacker. Are you using two-factor (or multi-factor) authentication on your web apps?