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What is an encryption "key" and what is the importance of
key length?
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What is are "proprietary" and "public" cryptographic algorithms?
What is an algorithm?
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 decryption?
What key size should be used ?
what are some of the current encryption schemes?
What is the life cycle of a key ?
How can we use quantum properties in cryptography ?
How Encoding is different from Encryption?
what is pretty good privacy?
What is secret-key cryptography ?
How to change the encrypted file icon?
Cryptography Algorithms 
