Encryption Theory_First Quiz 2022/2023

An Asymmetric-key (or public-key) cipher uses

• 1- Key

• 2-Key

• 3-Key

• 4-Key

In Cryptography, original message, before being transformed, is called

• Simple Text

• Plain Text

• Cipher Text

• Filled Text

An encryption algorithm transforms plain text into

• Cipher text

• Simple Text

• Empty Text

• Plain Text

In symmetric key cryptography, key used by sender and receiver is

• two keys are used

• private and public

• shared

• different

Shift ciphers sometimes referred to as the

• Julia cipher

• plain cipher

• Caesar cipher

• All of them

In asymmetric key cryptography, the private key is kept by

• Sender

• Receiver

• Sender and Receiver

• all the connected devices to the network

In cryptography, the order of the letters in a message is rearranged by

• transposition ciphers

• substitution ciphers

• substitution ciphers and transposition ciphers

• none of the mentioned

_______ is the science and art of transforming messages to make them secure and immune to attacks.

• Cryptography

• Cryptoanalysis

• neither Cryptography nor Cryptoanalysis

• either Cryptography or Cryptoanalysis

A(n) ______ algorithm transforms cipher text to plain text.

• Encryption

• Decryption

The _______ is a number or a set of numbers on which the cipher operates.

• secret

• cipher

• key

• none of the mentioned