Do digital signatures help detect altered documents and transmission errors?
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whats cryptanalysis?
Do digital signatures help detect altered documents and transmission errors?
What are the cfb and ofb modes?
why hash functions are not used for encryption but authentication ?
what is trapdoor and how does it works?
What is the Popular Symmetric-Key Encryption Method
What is the difference between a message authentication code (MAC) and a one-way hash?
what are some of the current encryption schemes?
What is private key cryptography and how we compare it with public key cryptography?
WHAT IS A SAMPLE USER INTERFACE OF DES ENCRYPTION/DECRYPTION PROJECT?
What is the life cycle of a key ?
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.
Cryptography Algorithms 
