1/2/2007

We do not recommend changing properties for pass phrase, salt value, init vector etc.. at all during runtime.

It is vital that if you want to transform files and strings back to their original plain text then the transformation must be executed using exactly the same settings for pass phrase, salt value etc.. as they were original encrypted.

Therefore it goes without saying that pass phrases, salt value etc.. should be persisted in some secure form to ensure encrypted data is not lost.