How to validate javax cipher key?

After decrypting, retrieve the saved hash from the end of the file and check that the hash of the decrypted file matches the saved hash. If not, something went wrong with very high probability.

I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.