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幸运哈希竞猜系统开发(源码部署)趣投哈希游戏玩法开发(案例需求)
2022-06-30 12:49:00 【开发搭建V_Whi366】
We believe that the meta universe must be a large community with real, social and economic behavior. DPK's star system is a meta universe, which requires only a little bit of construction. Let me talk about our preliminary plan in the meta universe. We have cooperated with a global fan association of large-scale animation. They have built a two-dimensional main city. We will help them realize a VR two-dimensional theme park on a planet.
哈希函数:将哈希表中元素的关键键值映射为元素存储位置的函数。哈希函数是哈希表中最重要的部分。一般来说,哈希函数会满足以下几个条件:
哈希函数应该易于计算,并且尽量使计算出来的索引值均匀分布,这能减少哈希冲突
哈希函数计算得到的哈希值是一个固定长度的输出值
如果Hash(key1)不等于Hash(key2),那么key1、key2一定不相等
如果Hash(key1)等于Hash(key2),那么key1、key2可能相等,也可能不相等(会发生哈希碰撞)
在哈希表的实际应用中,关键字的类型除了数字类型,还有可能是字符串类型、浮点数类型、大整数类型,甚至还有可能是几种类型的组合。一般会将各种类型的关键字先转换为整数类型,再通过哈希函数,将其映射到哈希表中。而关于整数类型的关键字,通常用到的哈希函数方法有:直接定址法、除留余数法、平方取中法、基数转换法、数字分析法、折叠法、随机数法、乘积法、点积法等。
各种哈希算法
使用单向Hash函数的目的是提供消息指纹,如果不同的消息可以生成相同的哈希值(称为发生了碰撞),那么攻击者就能根据揭示出来的规律攻破这个安全机制。
高安全强度的哈希函数应当为两条或多条不同的消息生成不同的哈希值。
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