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From: Gareth Dart
Date: Mar 6, 2007 9:10AM

It is possible to provide an audio equivalent of the secure image of numbers and letters - I did it with a php script that 'stitches' wav files of letters and numbers being read out together into a single .wav or mp3 file and supplied it to the user on demand. A malicious user would have to create a script that interpreted this file - certainly a nontrivial programming task.

G