Data Transmission: Errors and Encryption

What is meant by the term ciphertext when used in encryption?

• An encryption or decryption algorithm

• An encrypted message

• A type of session key

• Another name for plaintext

• Text following an encryption algorithm

When carrying out asymmetric encryption, which of the following users would keep the private key?

• The sender

• The receiver

• Both sender and receiver

• All recipients of the message

• None of the above

In encryption, which of the following is the term used to describe the message before it is encrypted?

• Simpletext

• Plaintext

• Notext

• Ciphertext

• Firstext

Which of the following is the biggest disadvantage of using symmetric encryption?

• It is very complex and time consuming

• It is rarely used anymore

• The value of the key reads the same in both directions

• It only works on computers with older operating systems

• There is a security problem when transmitting the encryption key

Which of the following is the correct name for a form of encryption in which both the sender and the recipient use the same key to encrypt and decrypt ?

• Symmetric key encryption

• Asymmetric key encryption

• Public key encryption

• Same key encryption

Which of the following is the final number in a code, which is calculated from all the numbers in the code, its purpose is to find errors in data entry?

• Parity check

• Checksum

• Parity bit

• Check digit

Which of the following is a form of error detection that makes use of a system of acknowledgements and timeouts ?

• Automatic Repeat Request

• Echo check

• Cyclic redundancy check

• Parity bit

Which of the following describes the check where the receiving computer sends back a copy of the data to the sending computer to allow it to compare the data ?

• Parity check

• Checksum

• Echo check

• Check digit