A nonlinear ring interferometer is choses as a structural model of a coder in nonlinear-dynamical cryptology. A model for a decoder utilizing a chaotic response is synthesized on the basis of the concept of chains of transposition points and the routing operator formalism. Possible bases for classification of nonlinear-dynamical cryptography devices and variants of their implementation are presented. Examples of the simulation of (de)coding in the dynamical chaos regime illustrate the influence of the parameters of the cryptosystem on the degree of confidentiality of the communication.
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