The subject matter of the article is opportunity use of a method of Pascal for finding of remainders of division of large numbers when using CRC. The goal is to analyze a possibility of use of a method of Pascal for definition of remainders of division in the CRC systems. Tasks: to analyze a possibility of use of CRC for noise-immune coding in different channels, to show a possibility of application of a method of Pascal for an image of noise-immune coding with use of checksums. The used methods are analytical method, methods of modal arithmetic’s. The received such results. The technique of calculation of Checksum of the message which are used for the control of integrity and restoration distorted the message is developed. Conclusions. Use of a method of Pascal for definition of remainders of division allows accelerating considerably process of search of various options the message, which will be restored. Realization of the offered method allows creating parallel structures, which give the chance to solve a problem of recovery of the message on the scale of real time.