Securing a JAVA chat client with RSA

[Joanna Spence]

Hello:

I have a simple java chat client that I would like to secure using RSA.

I have knowledge of how RSA works, but I am having trouble implementing it from JAVA.

If I need to obtain the Public Key from the server that my client connects to, do I need to have the ChatServer.java script obtain the Public Key from the server and then have my chatClient.java script grab that Public Key?

Please help, I need some direction.

[Rob Spoor]

Perhaps you can use javax.crypto.Cipher for this. With such a Cipher you can use CipherInputStream and CipherOutputStream around your sockets' streams, and the API will take care of the encryption for you.

java.security.Key, used with Cipher, has sub interfaces like RSAPublicKey and RSAPrivateKey so I'm quite sure Cipher could be used with RSA. A little browsing through the API may be able to help you further along the right path.

[Joanna Spence]

Thanks for your help.

Ok I am reading the API on the classes you suggested.

If I know that the server is storing the public key somewhere...how would I obtain that with the chatclient.java script?

Would you like me to the post the code that I have so far?

[Devaka Cooray]

"Elmira Love", please check your private messages regarding an important administrative matter.