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Fair enough. I didn't mean to suggest that these captchas are in any way good. Only that the author does appear to have technical knowledge of how they work - otherwise they wouldn't use terms like "control word", so it seems that the difficulty experienced was likely contrived for the purpose of writing the blog post.

For me at least, the point would have come across better if that (seemingly) false ignorance were dropped. (Either that, or frame it in terms of, "Here's what an average user sees when they try to log in," or something along those lines.)




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