$arr_19 ), array( 3, false, $arr_20, $arr_24 ), array( 2, false, "\" />", $arr_25 ) ) ); ?> $arr_27 ), array( 3, false, $arr_28, $arr_30 ), array( 2, false, "\" />\n\n", $arr_31 ) ) ); ?> array( 2, false, false, $arr_9 ), array( 4, $arr_10, "if", $arr_245, $arr_248 ), array( 2, false, "\n", $arr_249 ) ) ); ?> rr_466 ), array( 4, $arr_467, "if", $arr_482, $arr_484 ), array( 2, false, "\n", $arr_485 ) ) ); ?> ONE IN A MILLION » Linux Magazine
 

Do-it-yourself OCR with Perl modules

ONE IN A MILLION

Author(s):

SecurID tokens use an authentication system by RSA Security to give the user a valid key for logging onto the target system. A home-grown optical character recognition tool in Perl monitors the key generator.

My colleague Fergus recently noticed that his SecurID token displayed “000000,” and he posted a photo of this on Flickr. These keyfob tokens by SecurID output a different 6-digit number every 60 seconds. If the odds for any numeric sequence appearing are equal, the chance of getting to see “000000” is one in a million. It’s like winning the lottery! This lucky shot made me curious to find out what my keyfob displayed while I wasn’t looking. It is fairly easy to digitize the output with a webcam or a scanner, and optical character recognition (OCR) would give me the digits hidden in the pixel-based output. But because OCR vendors have more or less patented this area to death, there is little in the line of functional free software.

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