function [row,col]=hashreplacement(matrix,quantity,key1,key2,key3)
[x,y]=size(matrix);
row=zeros([1,quantity]);
col=zeros([1,quantity]);
j=zeros([1,quantity]);
for i=1:quantity
    v=round(i/x);
    u=mod(i,x);
    v=mod(v+md52num(md5(u+key1)),y);
    u=mod(u+md52num(md5(v+key2)),x);
    v=mod(v+md52num(md5(u+key3)),y);
    j(i)=v*x+u+1;
    col(i)=mod(j(i),y);
    row(i)=j(i)/y;
    row(i)=double(uint8(row(i)))+1;
    if col(i)==0
        col(i)=y;
        row(i)=row(i)-1;
    end
end