The development of computing resources in the post-quantum period calls into question the provision of the required level of stability of symmetric and asymmetric cryptography algorithms. The advent of a full-scale quantum computer based on the Shore and Grover algorithms greatly increases the capabilities of cybercriminals and reduces the resilience of cryptosystems used in protocols for basic security services. The article analyzes the main requirements for resistance to post-quantum cryptography algorithms. In such conditions, it is necessary to use modified cryptosystems that provide an integrated required level of stability and efficiency of cryptocurrencies. One such mechanism is the crypto-code constructs of McEliece and Niederriter, which provide the required indicators of durability, efficiency and reliability. The paper analyzes the construction of the crypto-code structure of the Niederriter on elliptical (EC), modified elliptical codes (MEC) shortened and / or extended, and defective codes, practical algorithms for their implementation. An advanced protocol for the formation of a digital signature using Niederriter crypto-code constructions is proposed.