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kotlinlang

what is the most/ a  popular library companies use to store sensitive information like social security number, passwords, etc. into a database?

Never ever ever ever ever ever write any password to any database or other persistent storage. That is a very big security no-no.

Always only write password hashes to the storage, then there is no way the password could be extracted by any vulnerability or similar

scrypt is currently pretty good as password "hash" afair

Also never store authentication tokens. Exact same reason

Hashes are generally one-way only, so if the application being written is a password manager, it would require the ability to transform in both directions.

Of course, but that is pretty unlikely with that question. :smile: