Question: Task E: (5 marks) Q1(2marks): Alice is running a privacy-preserving movie sale service, allowing customers to select 1 movie from the 1million candidates secretly. She

Task E: (5 marks) Q1(2marks): Alice is running a privacy-preserving movie sale service, allowing customers to select 1 movie from the 1million candidates secretly. She can run a 1-out-of-n OT protocol with each customer to implement the service securely. However, as the size of each movie is very large (say, 10GB), the overall computation and communication costs are very huge if there are many customers. Can you help Alice to run the service more efficiently? You can suppose that Alice has a large enough cloud storage that can be publicly accessed by the customer. Q2(3marks): Please describe how to construct a garbled circuit for the following boolean circuit composed of NAND gate. w5 w8 w2 w3 ---0 W10 w4 W6 W7 w9

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