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On p-ary Bent Functions Defined on Finite Fields  

김영식 (서울대학교 전기컴퓨터공학부 부호 및 암호 연구실)
장지웅 (서울대학교 전기컴퓨터공학부 부호 및 암호 연구)
노종선 (서울대학교 전기컴퓨터공학부 부호 및 암호 연구실)
Abstract
It is known that a bent function corresponds to a perfect nonlinear function, which makes it difficult to do the differential cryptanalysis in DES and in many other block ciphers. In this paper, for an odd prime p, quadratic p-ary bent functions defined on finite fields are given from the families of p-ary sequences with optimal correlation properly. And quadratic p-ary bent functions, that is, perfect nonlinear functions from the finite field F $_{p^{m}}$ to its prime field $F_{p}$ are constructed by using the trace functions. trace functions.
Keywords
Bent functions; bent sequences; perfect nonlinear function;
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