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function shval = shuffle(cvals,k,p) % This function hides and shuffles the cards whose values are passed % in the vector cvals. The hiding operation takes place by taking % cvals and raising its elements to the kth power mod p % Shuffling is a random permutation cln=length(cvals); hvals=zeros(cln,1); for j=1:cln, hvals(j)=powermod(cvals(j),k,p); end; % now to shuffle the cards ind=randperm(cln); shval=hvals(ind);