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What Is Encryption?
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why hash functions are not used for encryption but authentication ?
What are the counter and pcbc modes?
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What are some other public key cryptosystems ?
What is multiple encryption?
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 exhaustive key search ?
What is are "proprietary" and "public" cryptographic algorithms?
What key size should be used ?
What are the ecb and cbc modes?
what is the difference between encryption and hashing?
Cryptography Algorithms 
