It is cryptographic system that uses pair of private keys and pubic keys, private keys are only known to the owner. The creation of key pair depends upon the cryptographic procedures centered on mathematical problems to produce one way function. The effective security system keep the private key private and public keys openly distributed without compromising security. In such system, anyone can encrypt the message by using the public key but this message is only descripted with the private key that the only owner know. This system is known as asymmetric encryption. The key pair are used to control access to your cryptocurrency.