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This is a very thorough analysis of the security principles and usability of various Two Factor Authentication systems: https://wiki.shibboleth.net/confluence/display/~trscavo@ncsa.illinois.edu/Two-Factor+Authentication
This is a very thorough analysis of the security principles and usability of various Two Factor Authentication systems: https://wiki.shibboleth.net/confluence/display/~trscavo@ncsa.illinois.edu/Two-Factor+Authentication
@th One thing I'd like to see in that comparison is evaluating password managers as a separate column.