IAS CH2 QUIZ

Symmetric encryption remains by far the most widely used of the two types of encryption.

• TRUE

• FALSE

Rotor machines are sophisticated precomputer hardware devices that use substitution techniques.

• TRUE

• FALSE

Symmetric encryption is a form of cryptosystem in which encryption and decryption are performed using different keys. It is also known as non- conventional encryption.

• TRUE

• FALSE

With the use of symmetric encryption, the principal security problem is maintaining the secrecy of the key.

• TRUE

• FALSE

The process of converting from plaintext to ciphertext is known as deciphering or decryption.

• TRUE

• FALSE

The algorithm will produce a different output depending on the specific secret key being used at the time. The exact substitutions and transformations performed by the algorithm depend on the key.

• TRUE

• FALSE

When using symmetric encryption it is very important to keep the algorithm secret.

• TRUE

• FALSE

On average, half of all possible keys must be tried to achieve success with a brute-force attack.

• TRUE

• FALSE

Ciphertext generated using a computationally secure encryption scheme is impossible for an opponent to decrypt simply because the required information is not there.

• TRUE

• FALSE

Monoalphabetic ciphers are easy to break because they reflect the frequency data of the original alphabet.

• TRUE

• FALSE