| 摘要 |
The invention relates to a method for carrying out a multiplication modulo M of two n-digit digital numbers (X, Y) in relation to a radix m by means of an integrated circuit. The inventive method consists of the following steps: conventionally determined partial products I=X<SB>1</SB>*Y(0=1=n-1), beginning with the highest-ranking place, are formed; the partial product (I) is added ( 4 ) to a subtotal multiplied by m, in order to form a new subtotal; the summands (S, C) of the new subtotal are added ( 5 ) to a value from a plurality of pre-calculated values (A) which are attributed to classes, in order to form a new subtotal; the new subtotal is used for the addition ( 4 ) of the next step (I-1); the new subtotal is approximately compared with the pre-determined classes in order to establish in which class the new subtotal falls; and the pre-calculated value (A) pertaining to the determined class is used as a summand for the corresponding addition ( 5 ) of the next step (i-1).
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