Java: StreamCorruptedException occur when Decrypt object with DES

Question

I have two method for Encrypt-save and decrypt-load Object from file in Android Internal Storage.

Encrypt and save process is done without any problem, but when I w

Answer 1

You're making at least two major mistakes.

1. You have to use the same key to decrypt as you used to encrypt. You can't just generate a random key and except it to be able to decrypt anything. Cryptology isn't magic. You will have to arrange for the decryption key to be preserved somehow, transmitted if necessary, securely, and used at the decryption step.

2. You're encrypting once with the SealedObject and again with the CipherOutputStream; then in the reverse direction you're decrypting once with the CipherInputStream and again via the SealedObject. This won't actually work, because the Cipher object isn't in comparable states at sender and receiver, and in any case it's pointless. Lose either the SealedObject or the Cipher streams.