Page Comparison

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We distinguish two types of solutions :

• Automated solutions
  like CAPTCHA or non public automated turing tests, also known as reverse Turing tests
  It includes These kind of solutions include the following:
  • 2 : sound output
    This may be the best of bad options :
    • It allows access to blind people, and can easily be generated by a machine.
      But :
      • This type of test is not accessible for deaf people!
      • Speech recognition research is very advanced, and human has poor speech recognition faculties compared to image recognition.
  • 6 : heuristic checks
    This solution is a curative solution : it may find , and is not preventive.
    Indeed, heuristic check can point out that a user is not human only after this user as has caused damage, and non-human patterns have been identified. This is not a preventive solution.

• Manual solutions also known as Turing tests.
  it includes solutions These kind of tests include:
  • 1 : logic puzzles
    We completly agree with Matt May on this point. We also consider that designing logic puzzle that are not cultural or language
    dependant is only possible throught mathematical puzzles. But on this particular field, calculation, robots have already proved their superiority...
    Plus, generating automatically a large number of independant logical tests does not seem feasable. This is why we classified this solution hereas manual.

• • 5: Limited-use accounts
    This is the manual version of the heuristic checks.
  • 4 : live operator, by phone or chat
    This is the best option : real Turing tests. The only limiting factor is economic : providing operator for all requests without delay is surely a very expensive solution.

So what ?

• About security
  • a system security level is less or equal the lower security level of its sub components, so implementing a solution system (visual and sound captcha) would be as vulnarable as the worse most vulnarable solution.
  • Being able to easily change the tests is crucial see proof of concept

• Automatic :
  Coupling sensorial tests (speech or image recognition) with trivial logic puzzle
  

• Central humanity system?

• The blade runner game As we have already mentionned, building complex cognitive puzzle automaticaly is too complicated.
  We also see that bots are almost as good as human on sensorial tests (specialy on sounds based tests).
  We think that coupling sensorial tests and trivial logic puzzle is a simple way to add complexity and thus to trasnform a nearly trivial AI problem (sensorial only test) to a Complex AI problem.
  See this brillant article : Proposal for an Accessible Captcha