+--------------------------------------------------+ | Terminal Interface | +--------------------------------------------------+ | | | +----------------------------------------------+ | | | User Interface | | | +----------------------------------------------+ | | | Input/Output | | | +----------------------------------------------+ | | | | +----------------------------------------------+ | | | Communication | | | +----------------------------------------------+ | | | Network Protocols | | | +----------------------------------------------+ | | | Data Encryption | | | +----------------------------------------------+ | | | | +----------------------------------------------+ | | | User Management | | | +----------------------------------------------+ | | | User Authentication | | | +----------------------------------------------+ | | | User Authorization | | | +----------------------------------------------+ | | | +--------------------------------------------------+