Question: Attack on an Encryption Scheme. (15 points) Let F be the set of all function 0,1-0, 1. Consider the following private-key encryption scheme. TL 7TL

Attack on an Encryption Scheme. (15 points) Let F be the

Attack on an Encryption Scheme. (15 points) Let F be the set of all function 0,1"-0, 1". Consider the following private-key encryption scheme. TL 7TL . Gen: Return sk F chosen uniformly at random from the set F . Encsk(m): Return m F(m), where sk- F We have knowingly not defined the decryption scheme because it might not be efficient to decrypt this scheme even given sk - F! However, the encryption algorithm itself has an issue. Prove that the encryption scheme is not secure Attack on an Encryption Scheme. (15 points) Let F be the set of all function 0,1"-0, 1". Consider the following private-key encryption scheme. TL 7TL . Gen: Return sk F chosen uniformly at random from the set F . Encsk(m): Return m F(m), where sk- F We have knowingly not defined the decryption scheme because it might not be efficient to decrypt this scheme even given sk - F! However, the encryption algorithm itself has an issue. Prove that the encryption scheme is not secure

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