The third generation mobile devices will provide more and more features and as well, more and more security considerations. Sun Microsystems has announced their platform for such devices: Java 2 Micro Edition. J2ME provides portable application environment for the customer and embedded systems, including mobile devices. A user having a J2ME mobile device can download applications from open network and run them on his/her mobile device. An open network is also untrusted network. What happens if a user downloads a malicious application that reads all the user's personal data and sends it to a specified network server. Is this possible in the J2ME environments? This paper represents the new environments and discusses security risks related to them.
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