sefty of "EncryptbyPassPhrase"

Hello

I want using EncryptbyPassPhrasefor code some serialNumber

how much is  it safe?

and is hack of it is easy? (with out password)

I found this link to hack but I can not check it.(it make me worry)

Hacking-password-Encryption

I know Hash is better, but I Need to "Decrypt" my data.

thanks for your time