This week at LWN: Google Authenticator for multi-factor authentication
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The security-conscious will tell you that a multi-factor authentication scheme involves requiring items from two or more of the categories "things you know," "things you have," and "things you are." Passwords and passphrases both fall under the "things you know" umbrella, and while there are commercially viable options for the latter two categories — security dongles and biometric fingerprint scanners, for example — neither have taken off with the general public. Partly that is a cost issue, to be sure, but the complexity of public-key infrastructure (PKI) smart cards does not help, either.
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