Cryptography is the discipline that treats the principles, means, and methods for making plain information unintelligible and reconverting the unintelligible information back into an intelligible form. Cryptography has been around for hundreds of years but awareness of it has taken off with the wide use of the computer and open networks (e.g., INTERNET). Faster and more complex computers and communications systems have pushed the use and development of new cryptographic systems, which rely on the use of Public Key Cryptography.