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How can we prove mathematically that in Paillier cryptosystem decryption, our message is equal to the right side of $$M=L(c^{\lambda(n)}\bmod n^2)\,\mu\bmod n$$

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    $\begingroup$ Lindell's Book has it! $\endgroup$ – kelalaka Apr 13 at 14:27
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    $\begingroup$ As kelala mentions, there are plenty of standard sources for this. Perhaps you can show us what you have tried and then we could guide you from there $\endgroup$ – Daniel Apr 13 at 16:19

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