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Mitigating Dictionary Attacks with Text-Graphics Character Captchas.
Chanathip Namprempre
Matthew N. Dailey
Published in:
IEICE Trans. Fundam. Electron. Commun. Comput. Sci. (2007)
Keyphrases
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text graphics
narrative generation
shape primitives
engineering drawings
sparse representation
color palette
watermarking scheme
computer programs