Encryption Based

Let (E,D) be public key encryption scheme

secure against Chosen Cipher Text

attack(CCA) [NS, DDN].

Alice Bob

Aliceís Public

Encryption key x

c=E(x,doc)

docí=D(s, c)

If doc=docí

Then accept

(s,x)

Intuition for CR2: CCA Non Malleable

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