Two-factor authentication is catching on for a variety of consumer Web services. For those of you not in the know, this isn’t all that new. Years ago, various computer vendors set out to improve things with hardware-based two-factor authentication: Something uniquely in your possession that would generate a one-time code to work with a security appliance and better secure your logins. RSA made millions in this market, and over the years these tokens have been used by millions of users.
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