In a method for permuting and dividing 16 pieces of k-bit data held in 4k-bit long registers T.sub.0. T.sub.1, T.sub.2 and T.sub.3, k being an integer, the data of each register T.sub.i is ANDed with a desired one of mask data (00ffff00), (ff0000ff), (0000ffff) and (ffff0000), and such ANDs are ORed to obtain desired permuted data.

Dans une méthode pour permuter et diviser 16 morceaux de données de k-peu s'est tenu dans 4k-bit de longs registres T.sub.0. T.sub.1, T.sub.2 et T.sub.3, k étant un nombre entier, les données de chaque registre T.sub.i est ANDed avec désiré de données de masque (00ffff00), (ff0000ff), (0000ffff) et (ffff0000), et un tel ANDs sont ORed pour obtenir des données permutées désirées.
 
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