> For the complete documentation index, see [llms.txt](https://hacking-notes.jord4n.pro/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://hacking-notes.jord4n.pro/zh/hacking-wifi/wpa-wpa2-psk-network-attacks/precomputed-attacks/computation-speed-techniques-rainbow-tables.md).
# 计算速度技巧 - 彩虹表
关于使用彩虹表加速密码哈希查找的笔记。
彩虹表通过预计算的哈希值加快密码恢复。
它们把工作从恢复阶段转移到准备阶段。表中存储的是预计算值的链。
### 标准方法
对于每个密码候选项：
* 对其进行哈希。
* 将其与目标哈希进行比较。
* 检查它们是否匹配。
### 彩虹表方法
使用由预计算哈希链组成的字典。这样可以避免在查找过程中重新计算每个哈希。
代价是占用存储空间。查找越快，需要的预计算表就越大。
---
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