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3 votes

Katz and Lindell, proof of lemma 2.4

Intuitively, the reasoning behind their statement is that given your random variable $M$ equals $m$, then $\mathrm{Enc}_K(M)$ becomes $\mathrm{Enc}_K(m)$. To see this formally consider the statement $\...
ellipsoid's user avatar
1 vote

Why is perfect secrecy defined under a ciphertext-only threat model?

Perfect secrecy is about confidentiality (secret = confidential), and the weakest setting where it makes sense is in a ciphertext only attack. The other attacks are stronger, namely chosen ciphertext ...
kodlu's user avatar
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