Question: 4. (20 points) What is the trap-door one-way function? Why do we need it in public-key cryptosystem? For the following public-key cryptosystem, describe the underlying

4. (20 points) What is the trap-door one-way function? Why do

4. (20 points) What is the trap-door one-way function? Why do we need it in public-key cryptosystem? For the following public-key cryptosystem, describe the underlying one-way trap-door functions: (1) RSA public-key cryptosystem (2) ElGamal public-key cryptosystem

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