核心概念
Known algorithms for dense k-SUM and k-XOR are essentially optimal, supported by self-reduction and obfuscation techniques.
要約
The content discusses the optimality of algorithms for dense k-SUM and k-XOR problems. It introduces the average-case variant of the k-SUM conjecture, highlighting improvements in the dense regime using Wagner's k-tree algorithm. The paper proves optimality for k = 3, 4, 5, and a limited range for higher values. Self-reduction methods are employed to handle potentially malicious oracles. The results have implications for cryptanalysis applications.
- Introduction to Fine-Grained Cryptanalysis
- Average-case Variants of k-SUM Conjecture
- Results on Algorithm Optimality for Dense Regime
- Self-Reduction Techniques and Obfuscation Process
- Applications in Cryptanalysis and Beyond
統計
An average-case variant of the k-SUM conjecture asserts that finding k numbers that sum to 0 in a list of r random numbers cannot be done in much less than r⌈k/2⌉ time.
For parameters where rk ≫ N, significant improvements can be made using Wagner’s k-tree algorithm.
Assuming the average-case k-SUM conjecture, known algorithms are essentially optimal for k = 3, 4, 5.