Time delay identification in chaotic cryptosystems ruled by delay-differential equations

Удальцов В.С., Локе А., Ларже Л., Годжебуэр Ж.-П., Ситрин Д.С. Идентификация времени задержки в хаос-генерирующих цепях, описываемых дифференциальным уравнением с задержкой (на английском языке) // Оптический журнал. 2005. Т.72. №5 С. 23-28.

Udaltsov V.S., Locquet A., Larger L., Goedgebuer J.P., Citrin D.S. Time delay identification in chaotic cryptosystems ruled by delay-differential equations // Journal of Optical Technology. 2005. V. 72. № 5. P. 373-377. https://doi.org/10.1364/JOT.72.000373

Feedback circuits ruled by time-delayed differential equations(DDE) can be used as the emitters in optical and electronic chaos-based secure communications.The degree of security of communicationsis limited by the possibility ofrecovering the parameters of the chaos-generating emitter. We analyze several methods for recovering the time-delays in modified DDE-systems with two feedbacks. When increasing the gain factor of the feedbacks, the recovery of time-delay of modified circuit becomes diffcult or even impossible.