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//ElGamal Key Decryption
// Move scilab to current file directory
[u,t,n] = file()
n = strcat(n)
file_name = basename(n)+fileext(n)
file_name = strcat(file_name)
ind=strindex(n,file_name)
path = part(n,1:ind-1)
chdir(path)
exec("Chapter_4.sci",-1)
p = 11
r = 4
pt = 7
d = 3
e1 = 2
e2 = modulo(e1^d,p)
c1 = modulo(e1^r,p)
c2 = modulo(pt*e2^r,p)
x =c1^d
x_inv = mod_inv(x,p)
pt = modulo(c2*x_inv,p)
disp("Original plaintext")
disp(pt)
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