鸽巢原理

鸽巢原理是组合学中一个非常重要的原理。

The pigeonhole principle is a important principle in combinatorics .

用实质上相同的论证，我们可以证明下面关于鸽巢原理更一般的结论。

Using essentially the same argument , we can prove the following more general statement of the pigeonhole principle .

综述内容包括对现有密钥管理方案的分类，对典型密钥管理方案的描述及比较，以及总结各类方案的优劣。其次，文章提出一种利用鸽巢原理和哈希函数的随机密钥预分发方案。

The main content include categorizing the existing key management schemes , analyzing and comparing the typical schemes , evaluating and summarizing their mainly existing problems . Secondly , this paper proposes a random key predistribution scheme based on Pigeonhole principle and HASH function .