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?

<p>It is deterministic (D)</p> Signup and view all the answers

What does Pr[K = k] denote?

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

What is the purpose of the Gen algorithm?

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

What does Enc algorithm do?

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

What does Dec algorithm do?

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

What does perfect correctness imply?

<p>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.</p> Signup and view all the answers

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

<p>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.</p> Signup and view all the answers

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