Section 2: Data Transmission - Error Checks

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Various Error Checking methods and Encryption

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Jonathan Dunsby

Singapur

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Section 2: Data Transmission - Error Checks


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

por Jonathan Dunsby

reserved whether ODD left Parity bits used set number byte parity

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

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

ISBN Check calculated code mis digits Final typing errors barcodes entry

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

prevent intercepted intended stops unreadable sense data hacker anybody

sent encryption algorithm original ciphertext plaintext

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

needed key user two Both only decrypt everybody encrypt public private