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1. 中国科学院信息工程研究所信息安全国家重点实验室,北京100093
2. 中国科学院大学,北京 100049
Online First:2017-10,
Published:15 October 2017
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Shi-zhu TIAN. Permutations from APN power functions over
Shi-zhu TIAN. Permutations from APN power functions over
APN 函数是特征为 2 的有限域上达到最低差分均匀度的函数,其中最经典的是 APN 幂函数。在
<math xmlns="http://www.w3.org/1998/Math/MathML"> <msub> <mi>F</mi> <mrow> <msup> <mn>2</mn> <mrow> <mn>2</mn><mi>n</mi></mrow> </msup> </mrow> </msub> </math>
上的APN幂函数都是3-1函数。推广了前人在奇特征有限域上由2-1函数构造置换的思想,得到偶特征域上由3-1函数构造置换的方法,并由
<math xmlns="http://www.w3.org/1998/Math/MathML"> <msub> <mi>F</mi> <mrow> <msup> <mn>2</mn> <mrow> <mn>2</mn><mi>n</mi></mrow> </msup> </mrow> </msub> </math>
上的APN幂函数构造置换。根据这种构造,研究了此类置换的差分性质。
APN functions have the lowest differential uniform over finite fields with characteristic 2 and the APN power functions are the most classical ones.APN power functions are all 3-1 functions over
<math xmlns="http://www.w3.org/1998/Math/MathML"> <msub> <mi>F</mi> <mrow> <msup> <mn>2</mn> <mrow> <mn>2</mn><mi>n</mi></mrow> </msup> </mrow> </msub> </math>
.By generalizing the idea of changing 2-1 functions to 1-1 functions over finite fields with odd characteristics
methods to change 3-1 functions over finite fields with even characteristics into permutations were obtained and permutations from APN power functions over
<math xmlns="http://www.w3.org/1998/Math/MathML"> <msub> <mi>F</mi> <mrow> <msup> <mn>2</mn> <mrow> <mn>2</mn><mi>n</mi></mrow> </msup> </mrow> </msub> </math>
were constructed.According to the construction
the differential properties of permutations obtained by this method were discussed.
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