中文

由$\mathbb{F}_q^n$上对角线性映射确定的函数平均熵的下界

组合数学 2012-10-02 v2 信息论 math.IT

摘要

本文证明,如果f ⁣:FqnFqnf\colon\mathbb{F}_q^n\to\mathbb{F}_q^n是任意函数,且\bA=(A1,...,An)\bA=(A_1,..., A_n)Fqn\mathbb{F}_q^n上均匀分布,则对(k1,...,kn)Fqn(k_1,...,k_n)\in \mathbb{F}_q^n取平均时,f(\bA)+(k1A1,...,knAn)f(\bA)+(k_1A_1,...,k_nA_n)的Renyi熵(进而Shannon熵)至少约为log2(qn)n\log_2(q^n)-n。事实上,f(\bA)+(k1A1,...,knAn)f(\bA)+(k_1A_1,...,k_nA_n)的平均碰撞概率至多约为2n/qn2^n/q^n

关键词

引用

@article{arxiv.1105.3793,
  title  = {A lower bound on the average entropy of a function determined up to a diagonal linear map on F_q^n},
  author = {Yaron Shany and Ram Zamir},
  journal= {arXiv preprint arXiv:1105.3793},
  year   = {2012}
}

备注

second version with a considerably simplified proof of the main theorem and additional references. 6 pages