Decryption Error bad padding

Question

I am trying to send encrypted messages between two agents .I have a string that contains information that I convert to bytes encrypt it and then to string again to send the message. Messages are received however, at the receiving agent I get the following exception

javax.crypto.BadPaddingException: Decryption error at sun.security.rsa.RSAPadding.unpadV15(Unknown Source) at sun.security.rsa.RSAPadding.unpad(Unknown Source) at com.sun.crypto.provider.RSACipher.doFinal(RSACipher.java:354) at com.sun.crypto.provider.RSACipher.engineDoFinal(RSACipher.java:380) at javax.crypto.Cipher.doFinal(Cipher.java:2121) at Hi$1.action(Hi.java:72) at jade.core.behaviours.Behaviour.actionWrapper(Behaviour.java:344) at jade.core.Agent$ActiveLifeCycle.execute(Agent.java:1532) at jade.core.Agent.run(Agent.java:1471) at java.lang.Thread.run(Unknown Source)

I tried the code for agents in the same container and it works fine however, if they are on different container it doesn't.

This is how I encrypt the message:

String msg1="Message from bob 1"; // message MSGBOB = cipher.doFinal(msg1.getBytes("ISO-8859-1")); // encryption msg.setContent(new String (MSGBOB,"ISO-8859-1")); // conversion to string

This is how I decrypt it :

mm = msg.getContent().getBytes("ISO-8859-1");// received message m = new String(cipher.doFinal(mm),"ISO-8859-1"); // decryption

Assumung you use the correct key for decryption this sounds like an encoding issue. Transmitting binary data as a String may cause problems. How do you transmit the message? — Henry
– Henry, Commented Feb 25, 2015 at 7:28

Yazan · Accepted Answer · 2015-02-25 12:13:14Z

use base64 encoding for the output of the encryption, don't use new String() as some byte-values will not be represented correctly as string. so when reversed to bytes again it will not be the correct ciphered value

here is what i mean:

String msg1="Message from bob 1"; // message MSGBOB = cipher.doFinal(msg1.getBytes("ISO-8859-1")); // encryption msg.setContent(Base64.encode(MSGBOB)); // conversion to string This is how I decrypt it : mm = Base64.decode(msg.getContent());// received message m = new String(cipher.doFinal(mm),"ISO-8859-1"); // decryption

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