Error checking AND encryption

Question 1

name the types of error checking

Answer 1

Parity check
checksum
echo check
AQR check

Question 2

parity check

Answer 2

the calculation of and 8 or 16 bit data aka sum of all 1s to see if the data is ODD OR EVEN
out of 8 bits 7 bits are used last bit is added which is called A PARITY BIT ussaly the first or last bit

before transmition is sums the number of 1s and if odd the a 1 IS ADDED

IF EVEN THEN A 0 is added

Question 3

checksum

Answer 3

a value that is calculated to check for errors
a methord such as modulus 11 could be used to calculate this value
it is transmited with the packet and the reciving devices calculates it the same thing using the same methord to cross check the value it calculated and the value that was transmited

Question 4

echo check

Answer 4

once the data is recived from the sender the reciving device SENDS A COPY OF THE ORRIGNAL IT RECIVED BACK TO THE SENDER and the orignal sender checks the content of the data to the orrignal that was first sent and if they match it sends an okay message.

if it doesnt match it sends another packet and the old data is deleted

Question 5

ARQ

Answer 5

the sending device sends the first pacets
when it is recived the data is checked for errors using the 3 methords
once checked if there are no errors the reciving device sends an acknowledgment back

if an error was sent it does NOT send an acknowledgment thus the sender starts a timer if no response come from the reciving computer after that time frame then it resents the data

Question 6

check digit

Answer 6

method to check data when it comes to data entry like from a bar code scanner

a value is generated from the data and at some point in the qr or barcode it is added

when it is entered or scanned that value is part of the entry and the computer uses the same method to check the sum and see if the check digit value calculated matches the one entered and the data entered.

Question 7

Encryption

Answer 7

method of securing data for storage or transmission that scrambles and makes the data meaning less unless you know how it was encrypted

Question 8

name given to text before it has been encrypted

Answer 8

plain text COME ON IDIOT

Question 9

two types of encryption types?

Answer 9

symmetric and ASYMMETRIC

Question 10

encryption key

Answer 10

a type of algorithm that is used to encrypt data

Question 11

cipher text

Answer 11

the name given to data after transmission that was first encrypted

Question 12

symmetric encryption?

Answer 12

type of encryption that uses the same key to encrypt and decrypt data
PLAN TEXT ENCRYPTED USING A KEY AND IS DECRYPTED USING THE SAME ONE

Question 13

asymmetric encryption?

Answer 13

a type of encryption that uses two different types of keys
before sending it is encrypted using the public key which is public and every device has one

BUT TO DECRYPT THE DATA YOU SEED THE PRIVATE KEY WHICH IS DIFFERENT FOR EACH DATA TRANSMITION