A type of encryption that uses public keys and private keys to ensure data is secure

A method of checking transmitted data for errors; it makes use of acknowledgement and timeout to automatically request re-sending of data if the time interval before positive acknowledgement is too long

An additional digit appended to a number to check if the entered number is error-free; a data entry check and not a data transmission check

A verification method used to check if data transferred has been altered or corrupted; calculated from the block of data being sent

Encrypted data that is the result of putting a plaintext message through an encryption algorithm

An error checking method in which all the 1-bits in the data packet payload are added and the total is stored in the packet trailer; the same calculation is repeated at the receiving station

A small part of a message/data that is transmitted over a network; after transmission all the data packets are reassembled to form the original message/data

Another name for a hacker who intercepts data being transmitted on a wired or wireless network

A method used to check if data has been transferred correctly; data is sent to a receiver and then immediately sent back to the sender; the sender then checks if the received data matches the sent data

The process of making data meaningless to eavesdroppers; without the correct decryption key the data cannot be decoded

A complex piece of software that takes plaintext and generates an encrypted string known as ciphertext

Data that can be sent in both directions at the same time (simultaneously)

Data that can be sent in both directions but not at the same time

A number in a data packet header used to stop data packets that never reach their destination from ‘clogging up’ the data paths/routes

A stage in a network that can receive and transmit data packets

Part of the data packet which contains IP addresses of sender and receiver and includes a packet number to allow the reassembly of data packets

A method of transmission in which a message is broken into many data packets which can then be sent along pathways independently of each other

The part of a data packet that indicates the end of the data packet

Sending data down several channels/wires several bits at a time (usually 1 byte)

A bit (either 0 or 1) added to a byte of data in the most significant bit position; this ensures that the byte follows the correct even parity or odd parity protocol

A horizontal and vertical parity check on a block of data being transmitted

An extra byte of data sent at the end of a parity block; it is composed of the parity bits generated from a vertical parity check of the data block

A method used to check if data has been transferred correctly; it makes use of even parity (an even number of 1-bits) or odd parity (an odd number of 1-bits)

The actual data being carried in a data packet

The original text/message before it is put through an encryption algorithm

A type of encryption key which is known only to the single computer/user

A type of encryption key that is known to all users

A computer that can perform very fast calculations; it can perform calculations that are based on probability rather than simple 0 or 1 values; this gives a quantum computer the potential to process considerably more data than existing computers

The transmission of data over a network for live events where the data is sent as soon as it is received or generated

A device that enables data packets to be moved between different networks, for example to join a LAN to a WAN

Sending data down one channel/wire one bit at a time

Data that can be sent in one direction only

Data that arrives at the destination with the bits no longer synchronised

A type of encryption in which the same encryption key is used both to encrypt and decrypt a message

The time interval allowed to elapse before an acknowledgement is received (in the ARQ error detection method)

A type of serial data transmission which has become the industry standard for connecting computers to devices

Drawbacks of using the USB system

(Choose all that apply)

Benefits of using the USB system

Two common methods used to generate a check digit