Why are monoalphabetic ciphers considered easy to break? They are easy to break because ____________________. You just need to lay out the cipher text in a matrix and play with the columns. They reflect the frequency data of the original alphabet. There are only 25 possible keys. Using homophones has no substantial impact.

They reflect the frequency data of the original alphabet.

CFE Block 2 Classical Encryption

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Computer Science - Computer Security and Reliability

user_lira_cofre Created by 9 mon ago

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Trying every possible key on a piece of ciphertext until an intelligible translation into plaintext is obtained is known as ____________________.

What is the type of encryption where the same key is used for both encryption and decryption? It is known as ____________________.

A message, before encryption, is called ________________.

A scrambled message, after applying encryption, is called _____________.

In the symmetric model, what is assumed to be the only thing needed to be kept secret? It is the ________________.

__________________ is the original intelligible message while _______________ is the scrambled message.

Which of the following is NOT a substitution cipher? It is the ________________.

Why are monoalphabetic ciphers considered easy to break? They are easy to break because ____________________.

How many possibilities are there (in the English language) for any ciphertext using the Caesar cipher? There are __________ possibilities.

In the Playfair cipher, using the keyword MONARCHY, what would the ciphertext for 'Meeting at six' be? It would be ________________.

In the Playfair cipher, using the keyword MONARCHY, what would the ciphertext for 'meet' be? It would be ________________.

In the Playfair cipher, using the keyword MONARCHY, what would the ciphertext for 'stop' be? It would be ________________.

Using the standard Vigenere cipher and Table 2.3, what is the encrypted value of 'meeting at six' using the keyword 'donald'? It is ________________.

Which of these is a polyalphabetic cipher? It is the ________________.

Using the standard Vigenere cipher and Table 2.3, what is the encrypted value of 'crap' using the keyword 'poop'? It is ________________.

Identify a problem with the one-time pad. One issue is that ____________________.

Using the rail fence technique with depth 3, what is the encrypted value of 'The first test will kill you'? It is ________________.

Using the rail fence technique with depth 2, but doing it TWICE, what is the encrypted value of 'The first test will kill you'? It is ________________.

How many input pins are on each cylinder of a rotor machine? There are __________ input pins.

Which is an example of a rotor machine that has been used in the past? It is the ________________.

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CFE Block 2 Classical Encryption

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