> For the complete documentation index, see [llms.txt](https://jarrettgxz-sec.gitbook.io/penetration-testing-ethical-hacking-concepts/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://jarrettgxz-sec.gitbook.io/penetration-testing-ethical-hacking-concepts/credentials-brute-force-cracking/rainbow-attack/hash-database.md).

# Hash database

Online search engine/database for hash cracking related functionalities.

Hashes are usually encrypted in a way that is made to be extremely difficult to decrypt, unlike the common encryption. Thus, it is usually computationally unfeasible to attempt to decrypt a particular hash (reverse the process and recover the original input from the hash). A database of known hash-to-value can be helpful in discovering the value that was hashed.  

## CrackStation

CrackStation is an online database search engine service with a database that has access to billions of hash-to-value results. This service can be useful for discovering the value of a hash.

{% embed url="<https://crackstation.net/>" %}