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Your parameters that you provide are incomplete (in what group are you working?). Anyways, lets assume that you work in $\mathbb{Z}_p^*$, your have a generator $g$ and your public key is $y=g^x$. Then, if two ciphertexts share the same randomness $k$, they will look like $(c_1,c_2)=(g^k,m\cdot y^k)$ and $(c_1',c_2')=(g^k,m'\cdot y^k)$ for your two messages ...



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