?? ex4-14.m
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% ex4-14.m
% exercise 4.14 encryption
A = [0 0 1 0 0; 0 0 1 0 1; 1 0 0 1 1; 1 0 1 0 0 ;1 0 0 1 0; 0 1 1 1 1;
1 1 0 0 1; 1 1 1 1 1; 0 1 1 0 1; 0 1 0 0 1; 0 0 0 1 1; 1 0 0 1 0;
0 1 1 1 1; 1 0 0 1 1; 0 1 1 1 1; 0 0 1 1 0; 1 0 1 0 0]
[m,n] = size(A)
b = [3,-1,6,7,-5]
for i=1:m
for j=1:n
sum = 0;
for p = 1:n
sum = sum + b(p)*A(i,mod(j-p,n));
end;
C(i,j) = sum;
end; end;
save C 'message.mat'
%
% check
%
bhat = fft(b);
for i=1:m
Chat(i,:) = fft(C(i,:);
Xhat(i,:) = Chat./bhat;
X(i,:) = ifft(Xhat(i,:);
end;
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