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Controlling and monitoring access to the Intranet
Digital certificates provide excellent means of controlling and monitoring access to the Intranets. The certificate itself acts as a token for access control. The user must present it in order to access the Intranet or Internet site. The certificate could contain a series of digits and alphabets combined together. The best example can be the use of cash card or the prepaid mobile phone card. The customer pays for the required number of hours of mobile phone usage well in advance and scratches the card to obtain the "certificate". The customer then connects to the Intranet site of the phone company by dialing it and then enters the "secret" code. Upon entering this code, the phone company updates the usage records and permits the customer to use the services for the extended period.
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define reliable transmission of data
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