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    2009
    ACM
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    Evaluating existing audio CAPTCHAs and an interface optimized for non-visual use
    15 years 2 days ago
    Evaluating existing audio CAPTCHAs and an interface optimized for non-visual use
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    Audio CAPTCHAs were introduced as an accessible alternative for those unable to use the more common visual CAPTCHAs, but anecdotal accounts have suggested that they may be more di...
    Jeffrey P. Bigham, Anna Cavender
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