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) Common modulus attack. Assume that Alice and Bob share a same modulus 7 7 . Alice s public key is ( 7 7 ,

) Common modulus attack. Assume that
Alice and Bob share a same modulus 77. Alices
public key is (77,7). Similarly Bobs public key
is (77,11). The encryption is as follows:
Enc(ex, m)= mex mod N
Consider that Eve sees that two ciphertexts 2
and 3. In addition, she knows that the two ciphertexts come from a single plaintext message.
So 2= meA mod N and 3= meB mod N. Can
Eve construct a plaintext m from the two ciphertexts without knowing private keys, and (N)?
Explain the reason and compute the plaintext if
it is.

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