Aysmmetric cryptosystem definition
Aysmmetric cryptosystem means an algorithm or series of algorithms which provide a secure key pair. Digital signature is used for cryptographic signature methods and "electronic signature" is used for other paperless signature methods. Cryptography is the science of securing information. It is most commonly associated with systems that scramble information and then unscramble it. Security experts currently favor the cryptographic signature method known as Public Key Infrastructure (PKI) as the most secure and reliable method of signing contracts online. PKI uses an algorithm to encrypt online documents so that they will be accessible only to authorized parties. The parties have "keys" to read and sign the document, thus ensuring that no one else will be able to sign fraudulently. 16 By using digital signature or crytographic signature it provides a secured online payment in e-commerce transactions. But the major challenge to encryption-based security is cryptoanalysis, an activity to break the encryption by guessing keys.17