Representation of the large numbers with accounting of microprocessor capacity

The task of representation of the large numbers for performing basic arithmetic operations above them were carried out with the greatest possible speed is an important task in the cryptography. For definition of the best way of representation the large number, the analysis of three types of representation of numbers is executed: binary-coded decimal, binary, packed binary-coded decimal. On the basis of the analysis the conclusion has been made on what representation of number is preferable. For achievement of the maximal speed of performance of arithmetic operations, program realization was carried out in language of the assembler. The practical results confirming conclusions are received.