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Proving that RSA CCA is possible

The author forgot a few $\bmod n$ along the way. In particular, equation 9.2 is wrong, and should be $$E(PU,M_1)\times E(PU,M_2)\bmod n=E(PU,(M_1\times M_2\bmod n))$$ Also, what follows "note ...
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How can we measure the security levels of post-quantum cryptographic algorithms? Is there a standard way of this measurement?

Often times, (asymmetric) encryption schemes can be discussed in terms of provable security - we can show that the scheme is secure under certain attacks if the underlying cryptographic primative is ...
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