Mastering Probabilistic Encryption

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Questions and Answers

Which algorithm outputs a key according to some distribution?

Gen (correct)
Enc
Dec
All of the above

Which algorithm takes a key and a message as input and gives a ciphertext as output?

Gen
Enc (correct)
Dec
All of the above

Which algorithm takes a key and a ciphertext as input and gives a message as output?

Gen
Enc
Dec (correct)
All of the above

What does perfect correctness imply about the Dec algorithm?

It is deterministic (D) Signup and view all the answers

What does Pr[K = k] denote?

The probability that the key output by Gen is equal to k (B) Signup and view all the answers

What is the purpose of the Gen algorithm?

The purpose of the Gen algorithm is to output a key according to some distribution. Signup and view all the answers

What does Enc algorithm do?

The Enc algorithm takes a key and a message as input and gives a ciphertext as output. Signup and view all the answers

What does Dec algorithm do?

The Dec algorithm takes a key and a ciphertext as input and gives a message as output. Signup and view all the answers

What does perfect correctness imply?

Perfect correctness implies that the Dec algorithm is deterministic and for any key k, message m, and ciphertext c output by Enc, Dec(k, c) = m with probability 1. Signup and view all the answers

What do Pr[K = k] and Pr[M = m] denote?

Pr[K = k] denotes the probability that the key output by Gen is equal to k, and Pr[M = m] denotes the probability that the message takes on the value m. Signup and view all the answers