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A captcha should be an image with enough variations that a computer can't reliably recognize it, and whether the image is composed of actual pixels or just ASCII characters is irrelevant. This captcha in particular looks really weak; the letters seem to always be the same shape, without rotation, distortion nor noise. However, a captcha with the glyphs ...


All text-based CAPTCHAs are trivial to break if the adversary is motivated enough. There are been relatively serious claims from different teams of being able to break common text-based CAPTCHAs (although no public code that I'm aware of), including Google and Vicarious. This is simply because computer vision tasks such as determining the regions of a 2D ...

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