What is Public Key Cryptography (PKC)

This chapter introduces cryptography from information security phase rather than from deep mathematical and theoretical aspects, along with cryptography application in information security. The chapters introduce classical cryptography, block, stream cipher, and public key family, and with the most advance systems as elliptic curve, digital signature, cryptography key managements, and the last part of the chapter are the cryptography application in protocols, communications, e-mails, and the most advance research topics.