Quantum Cryptography

Nowadays, information is exchanged among the computer network. These data and information are involved in the business, military, academic education, research and etc. which are shared around the world in both private and public networks. Since, many categories of data are required restriction on the authorization of access, modify, delete, and insert, security in communication is increasingly important to network communication. Currently, computer security applies mathematic theory to computer security for encrypting and decrypting on both sender and receiver. To use a security attack with a high-performance computer (e.g. quantum computer), an attacker can find a key and then obtains the data infeasible period. Quantum cryptography is one of the solutions that use the property of polarization to ensure that transmitted data is not trapped by an eavesdropper. Quantum cryptography is improved significantly in the last decades including the most two dominant protocols BB84 and BB92.