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This article presents the design and implementation of a software application for the provision of secure real time communication services between workstations, based on the AES prototype cryptographic algorithm and an advanced secret key management system. The application has been designed based on the requirements of a military unit, so as to allow groups of authenticated users to communicate and read the transmitted messages. This application can be used as the basis for the design of an integrated communication system for a military organization. The present design confines its operation within the limits of a local area network, but the possibilities are open for operation in extended networks or the internet. In this article, a concise account of the design of the application is first presented. The way in which a symmetric encryption system uses a pair of secret keys to provide additional capabilities is hence presented. Consequently, the operation of a password management system is presented that achieves secure storage and handling of user secret passwords and access control data. Finally, the application implementation details are presented for a Visual Basic 6 implementation developed for a military unit.