Originally Posted by Chicken
That wouldn't help much for guild bank security. CAPTCHA is designed not to protect a system from being compromised, but to prevent a system from being used for automated services.
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If using the on-screen keypad placed to a random location to enter the numerical code CAPTCHA would (try to) prevent automated logging of the code by the keylogger. With suitable CAPTCHA the keylogger would be forced to take a screenshot of the game when the keypad is opened and recording the mouse movements and clicks and just sending the raw data for human processing instead of using automatic image recognition.
Obviously with or without CAPTCHA the numpad system wouldn't really prevent keylogger from logging the required data which was my point in the original reply.
Of course as others pointed out second password/numerical code for the guild bank could prevent access to the guild bank if the user with the keylogger does not access the guild bank while being vulnerable. The real question is if that is enough to annoy majority of users by having two passwords for WoW...