why hash functions are not used for encryption but
authentication ?
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What happens if my key is lost ?
What is key management ?
How to I prevent other users from using Kryptel (Silver Key)?
What are the disadvantages of public-key cryptography compared with secret-key cryptography?
How to find someone else?s public key ?
What are some other public key cryptosystems ?
How does one get a key pair ?
What is the rabin signature scheme?
What is the difference between a message authentication code (MAC) and a one-way hash?
What are the advantages and disadvantages of public key cryptography compared with secret key cryptography ?
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 is nonlinear cryptography?
Cryptography Algorithms 
