Prove that in RSA with public key (n,e) and n=pq, the amount of plaintexts x, with Ec(x)=x,
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Prove that in RSA with public key (n,e) and n=pq, the amount of plaintexts x, with Ec(x)=x, is dpdq, where dp=gcd(e-1,p-1) and dq=gcd(e-1,q-1).
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