AES Cipher in Java
How to implementing AES cipher in JAVA and main problems you may find in this challenge. When I started, I tried to do a parallel between my 3Des implementation and AES , so I discovered the first difference: I tried to generate a SecretKey from a pass-phrase for AES in the following way, KeySpec aesSpec = new KeySpec(key.getBytes(), "AES"); SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("AES"); SecretKey secretKey = keyFactory.generateSecret(aesSpec); This is the very similar how I do with 3Des : KeySpec TDesSpec = new DESKeySpec( key.getBytes()); SecretKeyFactory keyFactory = SecretKeyFactory.getInstance("DESede"); SecretKey secretKey = keyFactory.generateSecret(aesSpec); However when I tested, it threw an exception "AES SecretKeyFactory not available". So the solution was made some small change: SecretKey secretKey = new SecretKeySpec( key.getBytes() , "AES"); There are two hints here: The key