i have a problem in decrypting a message on the client side, as it shows the BadPaddingException:Final block is not padded properly. i am using DES, and using getInputStream and getOutputStream for sending and receiving data, first reading the length of the bytes n then byte itself. problem is, it works properly at first time, even for two clients but next time it shows exception.
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I had a similar problem just the other day. What I noticed is I was encrypting 16 bytes of data and the result was 32 bytes, but when I was sending the data I assumed I had 16 bytes. This essentially sheared the Padding bytes off. Print the length of the input byte array and then the length of the output byte array and compare.
I hope this is your issue also Good luck
PS. I also receive this error when I didn�t have the correct policy files!