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Section 2: Data Transmission - Error Checks

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Section 2: Data Transmission - Error Checks

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Various Error Checking methods and Encryption

Created by

Jonathan Dunsby
Jonathan Dunsby
Singapore

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Section 2: Data Transmission - Error Checks
 

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Section 2: Data Transmission - Error ChecksOnline version

Various Error Checking methods and Encryption

by Jonathan Dunsby
1

number used parity byte whether left set bits reserved ODD Parity

Checks : This method is based on the of 1 - in a of data . The can be either called EVEN or . One of the bits in the byte , - most bit is for a parity bit . The parity bit is according to the parity being is even or odd .

2

request algorithm end differences re data sender checksum blocks additional compared transmitted sent receiver send calculated

Check Sum : Data is sent in , and an value , called the , is sent at the of the block of . The checksum is from the block of data . Calculations are done using an agreed which has been agreed by and . Checksum is then with the block of data . The - calculated checksum is then to the checksum with the data block . A is made to re - the block of data if there are .

3

transmission sent compares error different device data checking two back occurred errors sender reliable back

ECHO CHECK : Data is to another , this data is sent again to the . The sender ? s computer the sets of to check if any occurred during the process . This process isn ? t very . As if the two sets of data are , it isn ? t known whether the error when sending the data in the first place , or if the occurred when sending the data for .

4

code errors typing Check digits entry Final mis barcodes calculated ISBN

CHECK - DIGIT : digit included in a ; it is from all the other in the code . digits are used for on products , such as International Standard Book Numbers ( ) used to identify in data caused by mis - or - scanning a barcode .

5

transmissions detected error until acknowledgements sending time negative positive automatically requests timeouts positive received number limit Time

ARQ : Uses and negative acknowledgements and . If no is detected , a positive acknowledgement is sent back to the
sending device . If an error is , the receiving device now sends a acknowledgement to the sending device and re - transmission of the data . - outs are used by the device by waiting a pre - determined amount of . No have been by the sending device within this time , it re - sends the data a acknowledgement is received or until a pre - determined of re - has taken place .

6

anybody data sense stops prevent intended intercepted unreadable hacker

Encryption alters into a form that is by for whom the data is not . It cannot the data being , but it it from making any to the eavesdropper - .

7

ciphertext plaintext encryption original sent algorithm

The data being is known as . Once it has gone through an , it produces :

8

symmetrical encrypt difficulty message recipient security both secret drawback intercepted email encryption key decrypt sender same

Symmetric uses an encryption ; the key is used to and the encoded message . The real is keeping the encryption key a ( for example , it needs to be sent in an or a text which can be ) . Therefore ,
the issue of is always the main of encryption , since a single encryption key is required for and .

9

needed key encrypt user two decrypt private only everybody public Both

Asymmetric encryption makes use of keys called the key and the key : The public key is made available to . Whereas the private is known to the computer . types of key are to and messages .

 
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