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Captcha Captcha Presentation Transcript

  • Captcha = C ompletely  A utomated  P ublic  T uring test to tell  C omputers and  H umans  A part. Creat in 2000 de catre Luis von Ahn, Manuel Blum, Nicholas J. Hopper, si John Langford pentru a stopa crearea automata a conturilor.
  • Ce este CAPTCHA? Metoda de a preveni spamul. Determina daca utilizatorul unui software este o persoana sau un program de calculator.
  • Ce este o aplicatie Captcha? Generator de teste care pot fi trecute usor de oameni dar nu si de programe. Solutia : este greu pentru un calculator sa distinga imaginile.
  • Cand folosim CAPTCHA? Oricand vrem sa evitam spamul : autentificare, commenturi, etc.
  • Cine foloseste CAPTCHA? Companii precum : Google: Hotmail: Yahoo
  • Tipuri CAPTCHA Cele mai intalnite sunt imaginile ce contin un text : Se i-a un text aleatoriu, se realizeaza o imagine cu textul distorsionat, si in cele din urma este generat un test pentru a recunoaste textul.
  • Tipuri CAPTCHA 3d CAPTCHA
  • Tipuri CAPTCHA Mathematical CAPTCHA
  • Tipuri CAPTCHA Alegerea variantei corecte.
  • Bibliografie http://www.worldit.info/articole/recaptcha-o-aplicatie-captcha-desteapta/ http://www.codinghorror.com/blog/2008/03/captcha-is-dead-long-live-captcha.html http://code.google.com/p/3dcaptcha/ http://mgccl.com/2007/06/07/why-should-we-nuke-the-spammers http://www.confidenttechnologies.com/demos/captcha-demo http://en.wikipedia.org/wiki/CAPTCHA