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What is key recovery ?
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Answer / ram
Key escrow (also known as a fair cryptosystem) is an
arrangement in which the keys
needed to decrypt encrypted data are held in escrow so
that, under certain
circumstances, an authorized third party may gain access to
those keys.
A key escrow system which relies on a trusted party to
recover a user's
confidential keys for use by law enforcement or national
security agencies acting
under "proper authority".
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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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