HTML: Secure Token Grid Authentication
André Liechti (contact me)
This class can be used to generate a grid of tokens to authenticate users similar to those that banks provided to users to avoid account abuses after phishing attacks.
It generates a bidimensional array of tokens of limited length with letters and digits.
The generated grid is seeded by a given secret salt string and a specific id that may be used to generate unique grids for different applications and users.
The class may also verify whether a token entered by the user corresponds to a token of a random grid position.
The grid tokens may also be formatted in an HTML table for presentation in Web pages. A sample PDF extended class is also provided to create PDF documents with included grid (using the LGPL http://www.tcpdf.org library)
Click here for detailed information about this class on phpclasses.org
Php Handleiding