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a company wants to transmit data over the telephone lines but there is a concern that the telephone lines may not be tapped. all of data is transmitted as four digit integers. you have been asked to write a computer program that will encrypt the data so that it may be transmitted more securely. the program should read a four-digit entered by the user and encrypt it as follows: replace each digit by the sum of digit plus 7 modules 10, then swap the first digit with the third and swap the second with the fourth. the program should then print the encrypted integer. it should also be able to decrypt the number to form the original integer and print it.
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