I'm going to talk about computer ... unfortunately for you! With a theme that seems a bit odd 'for everyone as we are in contact often, but not even know it. In the history of computers is often the problem arose of wanting to test a machine to see how its implementation is close to a human being, so to be able to think, an intelligent being. For this purpose, was born on Turing test that tests a computer interacting with beings human, in order to determine if they are unable to distinguish it from a thinking being. In recent years, however, it appeared necessary to verify the opposite: a machine wants to know if it is to really interact with a human being, here comes CAPTCHA stands for Completely the Automated Public Turing test to tell Computers and Humans Apart ( Public Turing test to distinguish between human and fully automated and computer. Well, when you find yourself having to type the letters mixed around the net, you are providing the system with which speak that you are human or computer better than you. For those who do not know this is intended to prevent some automated software repeatedly try to fill out the form on the CAPTCHA making numerous attempts to guess sensitive data (see Vodafone recharge codes or passwords different). This system requires human interaction which necessarily slowed the process of breach, because the image is designed to offer a proposal to any software that tries to "read" and letters (eg. OCR) the condition worst possible. I have talked about this because each company creates its CAPTCHA system and Russian researchers said they had violated probabilistically (the system automatically each time but do not guess with a good 35% in one day means hundreds of thousands of attempts good day) of the Yahoo CAPTCHA. If the system works There may be a risk of a significant amount is spam mail accounts and various violations .... We'll see:).
For info:
CAPTCHA Wiki
Blog Russian researchers
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