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

• an encryption or decryption algorithm

• a message before it has been encrypted

• a type of session key

• another name for plaintext

• text following an encryption algorithm

Which one of the following statements about asymmetric encryption is true?

• uses a public key only

• uses both a public key and a private key

• always uses 64-bit encryption

• the value of the private key is symmetrical

• uses private key only

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

• simpletext

• plaintext

• notext

• ciphertext

• firsttext

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

• block cipher encryption

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

• parity check

• checksum

• cyclic redundancy check

• 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

• check digit

• parity bit

• cyclic redundancy check

Which of the following methods uses an extra bit added to a byte to ensure it contains an even number of 1s or odd number of 1s?

• cyclic redundancy check

• parity check

• checksum

• check digit

• echo check

Which of the following uses a calculated value which is sent after a block of data: the receiving computer also calculates the value from the block of data and compares the values?

• parity check

• check digit

• packet switching

• checksum

• automatic repeat request

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?

• echo check

• automatic repeat request

• checksum

• parity check

• check digit