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What is public-key cryptography ?
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What is the difference between hardware and software encryption?
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 some other public key cryptosystems ?
why hash functions are not used for encryption but authentication ?
What is Ciphertext?
How should I store my private key ?
Can the computer which has been used for encryption be traced?
How do certifying authorities store their private keys ?
What is a zed encoder? How does it work?
What is the function of random numbers in encryption and how are they generated?
What happens if my key is lost ?
What is cryptographic synchronisation?
Cryptography Algorithms 
