|Budget Amount *help
¥1,900,000 (Direct Cost : ¥1,900,000)
Fiscal Year 1995 : ¥900,000 (Direct Cost : ¥900,000)
Fiscal Year 1994 : ¥1,000,000 (Direct Cost : ¥1,000,000)
In this research, we demonstrate how chaotic circuit can be used to implement a secure communication system and developed the secure communication methods.
1. Accurate circuit elements are required to realize secure communication sysrems. However, this disadvantage is exploited by using the general impedance converters.
2.Repeated chaotic modulations make the system more and more secure, and the spread spectrum communication is possible, since the transmitted sinal has a broad-band and noise-like spectrum.
3.New chaotic noise reduction circuit for restoring the digital signal is proposed, and its effectiveness is examined. Some strange behaviors, for example, propagation delay of information signals are found at the transmission process.
4.Unified approach to construct a rich variety of secure communication system is proposed.
5.Quantization of information signals does not corrupt the information signal at the demodulation process. In order to transmit a signal within 1% errors, we needs 16 bits data.
6.The secure communication system has a rich variety of encryption keys and the high sensitivity of synchronization versus parameter changes, and so the system is very secure.