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Questions and Answers
What is the probability distribution of message space for the shift cipher instance described?
What is the probability distribution of message space for the shift cipher instance described?
- Pr[M=a]=0.25, Pr[M=b]=0.5, Pr[M=c]=0.25 (correct)
- Pr[M=a]=0.5, Pr[M=b]=0.25, Pr[M=c]=0.25
- Pr[M=a]=0.14, Pr[M=b]=0.36, Pr[M=c]=0.5
- Pr[M=a]=0.3, Pr[M=b]=0.3, Pr[M=c]=0.4
What is the correct statement regarding the probability of the ciphertext 'D' and 'E' in the given shift cipher instance?
What is the correct statement regarding the probability of the ciphertext 'D' and 'E' in the given shift cipher instance?
- Probability that the ciphertext is “D” is 126
- Probability that the ciphertext is “A” is 14th the probability that the ciphertext is “D”
- Probability that the ciphertext is “D” is half the probability that the ciphertext is “E”
- Probability that the ciphertext is “D” is the same as the probability that the ciphertext is “E” (correct)
What is the incorrect statement about the probabilities in the given shift cipher instance?
What is the incorrect statement about the probabilities in the given shift cipher instance?
- The probability that the ciphertext is 'D' is 126 (correct)
- The probability that the ciphertext is 'E' is double the probability of 'A'
- The probability that the ciphertext is 'E' is higher than 'A'
- The probability that the ciphertext is 'B' is 5 times higher than 'A'
In the given shift cipher with the provided probability distribution, what is the likelihood of generating a message 'A'?
In the given shift cipher with the provided probability distribution, what is the likelihood of generating a message 'A'?
Which statement correctly compares the probabilities of 'D' and 'E' in the shift cipher instance?
Which statement correctly compares the probabilities of 'D' and 'E' in the shift cipher instance?
Which of the following encryption schemes is not perfectly secure?
Which of the following encryption schemes is not perfectly secure?
In a perfectly-secure encryption scheme, which condition is valid?
In a perfectly-secure encryption scheme, which condition is valid?
In a Vigenère cryptosystem, if the word 'CRYPTOGRAPHY' occurs twice in a 500-character encrypted message, what is the length of the encryption key?
In a Vigenère cryptosystem, if the word 'CRYPTOGRAPHY' occurs twice in a 500-character encrypted message, what is the length of the encryption key?
Which statement is correct about encryption schemes?
Which statement is correct about encryption schemes?
Which of the following conditions is necessary for perfect security in encryption?
Which of the following conditions is necessary for perfect security in encryption?
