Section 2: Data Transmission - Error Checks

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Various Error Checking methods and Encryption

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Jonathan Dunsby

Singapore

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Section 2: Data Transmission - Error Checks


Compléter Section 2: Data Transmission - Error ChecksVersion en ligne Various Error Checking methods and Encryption par Jonathan Dunsby 1 set byte left bits whether reserved Parity used number parity ODD 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 sender receiver transmitted send sent checksum differences re end blocks data calculated additional compared algorithm 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 different back errors sent back checking two occurred device sender transmission compares error reliable data 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 errors Final entry typing ISBN Check digits barcodes code mis calculated 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 acknowledgements Time requests number detected received error sending limit positive time transmissions positive negative until timeouts automatically 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 stops intercepted prevent hacker unreadable intended sense data 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 sent ciphertext algorithm plaintext encryption original The data being is known as . Once it has gone through an , it produces : 8 symmetrical difficulty drawback sender key secret both same message encryption email intercepted recipient decrypt security encrypt 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 private two encrypt Both public user needed decrypt only key everybody 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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Section 2: Data Transmission - Error Checks

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Section 2: Data Transmission - Error ChecksVersion en ligne

par Jonathan Dunsby

set byte left bits whether reserved Parity used number parity ODD

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

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

errors Final entry typing ISBN Check digits barcodes code mis calculated

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

anybody stops intercepted prevent hacker unreadable intended sense data

sent ciphertext algorithm plaintext encryption original

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

private two encrypt Both public user needed decrypt only key everybody