Titlebook: Handbook of Data Communications and Networks; Bill Buchanan Book 1999 Springer Science+Business Media Dordrecht 1999 UNIX.coding.communica

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Error Coding Principles, request a retransmission or discard the data. With error correction the receiver detects an error and tries to correct as many error bits as possible. Again, the more error coding bits are used, the more bits can be corrected. An error correction code is normally used when the receiver cannot request a retransmission.

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Data Encryption Principles, as they are normally taken by a courier or postal service and transported in a secure environment from source to destination. Over the coming years more individuals and companies will be using electronic mail systems and these must be totally secure.

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Data Encryption, or a leased line). The two most popular private-key techniques are DES (Data Encryption Standard) and IDEA (International Data Encryption Algorithm) and a popular public-key technique is RSA (named after its inventors, Rivest, Shamir and Adleman).

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Part III: Changes in Unfavourable Behaviour,Most sources of information contain redundant information or information that adds little to the stored data. An example of this might be the storage of a rectangular image.