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Category Archives: Other technical

Porting a custom Gina to a Credential provider

Tuesday, February 24, 2009

Making a replacement Gina behave like a Credential Provider (not the other way around) looks like the ticket to have a single source solution to a Gina and Credential Provider.

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Segmentation example in a CAPTCHA

Monday, February 9, 2009

From time to time, I come across an application whose designers need – or think they need – a CAPTCHA. I stay convinced that CAPTCHA are to be avoided. This post just goes to show the effect of segmentation on optical character recognition (OCR). If you read about artificial intelligence and character recognition, you will [...]

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Ne jouez pas avec un CAPTCHA sans la surveillance d’un expert

Friday, February 6, 2009

Je suis tombé sur cette implémentation d’un CAPTCHA. Je déteste les CAPTCHA. C’est comme de la mauvaise crypto. Fondamentalement, le CAPTCHA ne fonctionne pas. La tâche d’analyse (le test de Turing) est complexe juste parce que personne ne s’est encore donné la peine d’écrire le code pour réussir. C’est aussi vrai pour la crypto classique, [...]

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