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    <p>If you absolutely do not want to use SSL with certificates, you can roll your own, though it won't be as secure obviously. I'm just improvising here, mixing a little asymmetric crypto with port-knocking.</p> <p>First, create a random RSA key pair in the client, in-memory, no need to store it anywhere. Client then connects to server using a plain Socket, and upon connection, sends the server the public key (encode as you wish, so that you can read it easily on the server). Server then generates a random 128-bit key, starts ANOTHER ServerSocket in a random port, and encrypts the 128-bit key and the new server port number, using the client's public key, and sends the data back to the client. Server must wait for a short period of time to receive a connection from the same client on the new port.</p> <p>Client closes connection, deciphers data, and opens a new Socket to the server on the specified port. Then both client and server must wrap the socket's InputStream and OutputStream on a CipherInputStream and CipherOutputStream using AES/CBC/PKCS5Padding (or RC4 if you prefer) with the specified 128-bit key. Voilá, you have a secure connection between client and server, without any authentication.</p> <p>If you want to handle authentication you can do so over the secure connection, or on the first connection the server can have RSA key pair as well, they exchange keys and the server can send a challenge to the client (the server sends the challenge to the client using the client's public key and the client responds to the challenge using the server's public key). But that's unnecessarily complicated and I think you'd be better off using standard SSL with keystores anyway... perhaps you can get create an in-memory KeyStore on the client and send it to the server as explained above using the first connection (encrypt the keystore with the server's public key) and then you can set up the second connection to use SSL with that keystore which is temporary and will be discarded when the client disconnects.</p>
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    1. POJava SSL sockets without authentication or stores?
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