[code_biologist]

Salting your hash should work?

You could also use a 32 or 64 bit block cipher like skip32 if you want to prevent reversal. Or at least, it makes reversing non-trivial.

[VWWHFSfQ]

This is a common misconception. hashids is _not_ an encryption algorithm. It's just an encoding with a tiny bit of obscurity layered in. hashids.org:

> Do not encode sensitive data. This includes sensitive integers, like numeric passwords or PIN numbers. This is not a true encryption algorithm. There are people that dedicate their lives to cryptography and there are plenty of more appropriate algorithms: bcrypt, md5, aes, sha1, blowfish.