| http://www.w3.org/ns/prov#value | - ule e=f (G(x)),u) wherein G(x) is a value derived from said message x and the function f is such that G(x) is able to be calculated from e and u using a function H(u-1,e)=G(x); and e) calculating said value y proceeding from a value q selected to be a divisor of p-1 according to the rule ar+bs+c=0 (mod q) where (a,b,c) is a permutation of the values e', y, l and where e' is an integer and is deriv
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