What are the ecb and cbc modes?
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What is an encryption "key" and what is the importance of key length?
What is luc?
whats cryptanalysis?
What is the life cycle of a key ?
What key size should be used ?
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 if a certifying authority?s key is lost or compromised ?
What are the disadvantages of public-key cryptography compared with secret-key cryptography?
what is the difference between encryption and hashing?
Can the computer which has been used for encryption be traced?
Do digital signatures help detect altered documents and transmission errors?
What is decryption?
Cryptography Algorithms 
