why hash functions are not used for encryption but
authentication ?
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How to find someone else?s public key ?
What are the counter and pcbc modes?
What happens if my key is lost ?
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What is nonlinear cryptography?
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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.
What are the advantages and disadvantages of public key cryptography compared with secret key cryptography ?
what is trapdoor and how does it works?
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