The Internet is not a safe environment. A popular method of intercepting user's login - password pair is sniffing. A potential attacker doesn 't have to be a professional. The Web is full of programs that even beginners can use. Other problem is maintenance of passwords. Every one uses a lot of services on many different portals. On every of these portals user has to register. Writing the login-password pair somewhere on paper is not a best idea, but many people does it. There is a possibility of using the same password every time, but a problem occurs when there is a need of changing the password. A good solution for all of these problems would be a system of authorization, working as a module, which could be attached to any application that would need user authentication and bounded access to the resources. Such system would have to be flexible enough to communicate with applications that use it, in some independent way. It would also have to be platform independent and secure.
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