When designing future communication networks, the actual problem is to ensure the security of their functioning, taking into account the development trends of telecommunication management systems, restrictions on functionality and compatibility of network elements, as well as the implementation of network scalability. The known encryption algorithm based on trigonometric functions, supports a fixed number of secret key parameters, preventing an increase in its cryptographic strength. This paper presents a symmetric cryptosystem based on trigonometric functions, which provides low inertia, improved performance and cryptographic strength. The procedure for the formation of the cryptogram is implemented by adding the results of parallel calculations of its components according to an individual algorithm defined by its function with its parameters. The obtained results can be used in communication, computing and information systems, for realization of storage and transmission processes of confidential information.