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How is an s-box value of AES can be modified? How is it
done?
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why hash functions are not used for encryption but authentication ?
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 of the current encryption schemes?
What is the elgamal cryptosystem?
What is the mceliece cryptosystem?
What is the difference between a message authentication code (MAC) and a one-way hash?
What is public key encryption?
what is the difference between encryption and hashing?
What is are "proprietary" and "public" cryptographic algorithms?
What are "stream" and "block" ciphers?
What is key recovery ?
What is private key cryptography and how we compare it with public key cryptography?
Cryptography Algorithms 
