Urgent - Sending Secret Text from Socket

Question

First of all, this is my finishing project. My project has a client and server parts. Server sends the DES key and client initializes it . It is working fine when I check. But the problem is I'm sending encrypted text to the server. And it is stored in SQL DB. then I retrieve the text and decrypt it. And here the problem starts . It throws some exceptions. They are
DES Bad Padding Exception2 !
   DES Illegal Block Size2 !I looked the text that is stored in db. The encrypted text is sent to Server and DB is in server's computer. The encrypted text and the text in DB are same.
Then I again get the encrypted text from the server and I compare the texts all are the same. Wht is my problem? Is it because of the sending error of sockets (I use TCP Socket) . And when I don't use encryption the data are sent very perfectly.
Please Help. I cannot find my problem. And if there are someone doing similar projects please contact me.. msn: [email protected]

Answer 1

I bet you are converting the encrypted bytes to a String using
String toStoreInDB = new String(encryptedBytes);
Your encrypted bytes will look very random and using your default encoding system will probably not convert properly using this approach. Centainly the transform bytes -> String -> bytes will probably not get back your original bytes.
You have two possible approaches.
1) Define your DB column to hold bytes (not CHAR or VARCHAR).
2) Encode the encrypted bytes. I would use Base64 encoding but HEX and many other encoding systems are just as good.