What are some other public key cryptosystems ?
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What is Ciphertext?
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 is luc?
Can the computer which has been used for encryption be traced?
Blowfish uses the longest key. Does this mean it is the strongest cipher?
What is nonlinear cryptography?
What is the rabin signature scheme?
What is the life cycle of a key ?
What happens when a key expires ?
Do encrypted files contain password in some form?
Actual role of cryptography is data security .Explain with real world example?
Cryptography Algorithms 
