What is the difference between Kryptel and Silver Key?

2044

What is the difference between a message authentication code (MAC) and a one-way hash?

3796

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

1760

whats cryptanalysis?

2068

What is an algorithm?

2266

How to I prevent other users from using Kryptel (Silver Key)?

1892

What are some other public key cryptosystems ?

1980

What is the rabin signature scheme?

853

What is multiple encryption?

898

What is luc?

839

What are the cfb and ofb modes?

866

What is nonlinear cryptography?

6236

How do certifying authorities store their private keys ?

2446

What are "stream" and "block" ciphers?

1945

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.

3468