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Symmetric key encryption: Suppose ( KeyGen , Enc, Dec ) is an IND - CPA secure symmetric key encryption. We define the following new encryption
Symmetric key encryption: Suppose KeyGen Enc, Dec is an
INDCPA secure symmetric key encryption. We define the following
new encryption algorithms, are the new schemes still INDCPA
secure Briefly explain why. If you believe it is insecure, provide an
explicit attacker violating the INDCPA definition.
Q: is defined as follows:
It runs Enc and obtains ;
It runs Enc again to obtain The final ciphertext
will be pts
Q: is defined as follows:
It runs Enc and obtains ;
It runs on to obtain where is a pseudorandom
generator. The final ciphertext will be pts NO CHATGPT OR AI PLEASE
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