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If you're designing a Captcha system...
posted Thursday, 25 August 2005
... then it's certainly worthwhile taking a look at this site I came across today: http://sam.zoy.org/pwntcha/
Boiling it down, it looks like the essentials of a good captcha are:
- don't use the same font throughout
- don't align your glyphs
- do throw in some character rotation
- do use a textured background that varies
- do vary colours
Oh and last but not least, do ensure that it's always humanly solvable. I tried signing up for a site the other day and gave up after failing to get past the captcha!
Boiling it down, it looks like the essentials of a good captcha are:
- don't use the same font throughout
- don't align your glyphs
- do throw in some character rotation
- do use a textured background that varies
- do vary colours
Oh and last but not least, do ensure that it's always humanly solvable. I tried signing up for a site the other day and gave up after failing to get past the captcha!