PPT-Cryptography Lecture 7 CPA-security

k c m c Enc k m k m 1 c 1 Enc k m 1 m 2 c 2 Enc k m 2 c 1 c 2 Is the threat model too strong In practice there are many ways an attacker can

functions function pseudorandom funcn function functions funcn pseudorandom enck random uniform attacker cpa chosen encryption encrypted func plaintext uniformly

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