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Securing SSH access with pam captcha - Michael Boman

Then I found pam_captcha, and it seems like my worries are over. pam_captcha is a ascii-art captcha system (you know, sometimes on the web you need to enter some text that are written, very often deformed, in an image) that utilities figlet (a text to ascii-art program) to make sure there is a human at the keyboard while going for keyboard interactive password authentication. A session can look like this:
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