To encrypt the direct communication between a j2eeweb and another php Server, give me some advice.

To encrypt the direct communication between a j2eeweb and another php server, you need to create a simple symmetric encryption algorithm for the key, when a java server communicates directly with the php server, the transmitted data is encrypted, but I will use a little bit of php. please give us some ideas and do not use php extension, php is 5.1 and java is 6. thanks for the encryption of direct communication between j2eeweb and another php server.
A simple symmetric encryption algorithm is required to encrypt the transmitted data when a java server communicates directly with the php server. However, I will use php a little bit. please give me some ideas, do not use php extension. php is 5.1, and java is 6. thanks very much for sharing the data of java encryption php algorithm:
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Use php to implement the java encryption and decryption algorithm, and then use curl to simulate data interaction.