Java Remote Method Invocation is an implementation of Remote Procedure Call in object oriented environment. However its security level can be regarded as very low. By using additional technologies: Kerberos and Java Authentication and Authorization Service, one can greatly improve Java Remote Method Invocation security. These enhancements are called Secure RMI. It is shown that by using Secure RMI three conditions of secure communication can be satisfied, namely: integrity, confidentiality and authentication. In modern computer systems there is also a requirement for authorization. It is handled by Secure RMI as well. Finally, performance of system build by using Secure RMI is studied.