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Answer Posted / dalgin augustinr
Key size can be set depend up on the purpose of use. key
can be created with 256, 512,1024,2048...
256 and 512 are already cracked and its
not too secure.
1024 is an effective and secure key size that we can use
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A company wants to transmit data over the telephone, but it is concerned that its phones may be tapped. All of its data is transmitted as four-digit integers. It has asked you to write a program that will encrypt its data so that the data may be transmitted more securely. Your script should read a four digit integer entered by the user in a prompt dialog and encrypt it as follows: Replace each digit by (the sum of that digit plus 7) modulus 10. Then swap the first digit with the third, and swap the second digit with the fourth. Then output XHTML text that displays the encrypted integer.
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