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The IEEE 802.15.4 standard was designed to support the specification of wireless sensor networks (WSNs) and wireless sensor and actuator networks (WSANs), which the utilization is emerging within environments with real-time requirements such as industrial and aerospace. The network simulator NS-2 supports the test, simulation and evaluation of such type of… (More)
We discuss and compare several concepts of optical cryptographic systems currently being proposed to improve communication security, their strong points and weaknesses. We will focus on approaches based on chaos synchronization.