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.

3438

What is an algorithm?

2221

what are some of the current encryption schemes?

2925

What is private key cryptography and how we compare it with public key cryptography?

1722

What is decryption?

872

Blowfish uses the longest key. Does this mean it is the strongest cipher?

2221

Do digital signatures help detect altered documents and transmission errors?

968

What is luc?

799

What is the mceliece cryptosystem?

853

What are the disadvantages of public-key cryptography compared with secret-key cryptography?

770

What is a zed encoder? How does it work?

2639

What is the rabin signature scheme?

817

Is there a limit on the file size or on the number of encrypted files?

1872

What is exhaustive key search ?

2023

Do encrypted files contain password in some form?

2014