The parameters n,e and the function f are chosen by the key generationcenter, and all the users have the same n,e and the same algorithmicdescription of f stored in their smart cards. These values can bemade public, but the factorization of n should be known only to thekey generation center. The only difference between users is the valueof i, and the secret key which corresponds to i is the (unique) numberg such that
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