2003 | OriginalPaper | Buchkapitel
Moderately Hard Functions: From Complexity to Spam Fighting
verfasst von : Moni Naor
Erschienen in: FST TCS 2003: Foundations of Software Technology and Theoretical Computer Science
Verlag: Springer Berlin Heidelberg
Enthalten in: Professional Book Archive
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A key idea in cryptography is using hard functions in order to obtain secure schemes. The theory of hard functions (e.g. one-way functions) has been a great success story, and the community has developed a fairly strong understanding of what types of cryptographic primitives can be achieved under which assumption.We explore the idea of using moderately hard functions in order to achieve many tasks for which a perfect solution is impossible, for instance, denial-of-service. We survey some of the applications of such functions and in particular describe the properties moderately hard functions need for fighting unsolicited electronic mail. We suggest several research directions and (re)call for the development of a theory of such functions.