What are the best practices to implement a secure CAPTCHA?

Also I want to know:
What is the best way to identify an insecure CAPTCHA?

  • These are 2 very, very different questions. As for your first, have you seen the documents online that specify how to do this?
    – schroeder
    Nov 3, 2015 at 23:39
  • no, can you share me good documentation please?
    – hmrojas.p
    Nov 4, 2015 at 0:04
  • We require that you have done a little research before posting here. Please look up how other implementations work and then come back with specific questions about what you still need help with,
    – schroeder
    Nov 4, 2015 at 0:42
  • Ok I understand, sorry
    – hmrojas.p
    Nov 4, 2015 at 14:51


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