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1. [RSA, 20) Consider a variant of RSA encryption. Everything is the same as in the textbook RSA except: P = C= 24and Enc((71, e),

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1. [RSA, 20) Consider a variant of RSA encryption. Everything is the same as in the textbook RSA except: P = C= 24and Enc((71, e), m) 1. Pick a random re- 2. Set c = (m+r) mod ya. 3. Output the ciphertext c= (r, ci). A Give the decryption algorithm for this scheme. B In this scheme is CPA-Recure? Prove or disprove using the CPA Inulis- tinguishability Experiment for Publice Key Encryption. 1. [RSA, 20) Consider a variant of RSA encryption. Everything is the same as in the textbook RSA except: P = C= 24and Enc((71, e), m) 1. Pick a random re- 2. Set c = (m+r) mod ya. 3. Output the ciphertext c= (r, ci). A Give the decryption algorithm for this scheme. B In this scheme is CPA-Recure? Prove or disprove using the CPA Inulis- tinguishability Experiment for Publice Key Encryption

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