Understanding the IND-CPA Security of CTR and CBC Encryption Modes 🔐
Explore how CTR and CBC modes ensure IND-CPA security, the impact of birthday attacks on CTR, and the theoretical guarantees assuming PRF security. A must-read for cryptography enthusiasts!
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Birthday attack on IND-CPA security of CTR$. Theorem showing CTR$ is IND-CPA secure assuming the underlying family of functions is PRF-secure, with bounds matching the birthday attack to show latter is best possible. Proof of theorem, using a game sequence. Fundamental Lemma of Game Playing. Applications of the Theorem.
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Mar 31, 2021
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