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what is pretty good privacy?
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what is the difference between encryption and hashing?
What is the mceliece cryptosystem?
How does one get a key pair ?
What is meant by 1024, 2048, 5096 bit encryption?
Is there a limit on the file size or on the number of encrypted files?
What key size should be used ?
What is secret-key cryptography ?
What is decryption?
why hash functions are not used for encryption but authentication ?
How can we use quantum properties in cryptography ?
What is the difference between a message authentication code (MAC) and a one-way hash?
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.
Cryptography Algorithms 
