Abstract: A secure communication without Eavesdropping is a big problem. While the early Internet and other networks have been constructed for universities, has reached its applications areas as business and electronic commerce, where the sharing of private information and critical issues such as credit card should not be exposed to attack by interception. Recently, many projects have been published and implemented similar systems with the RSA algorithm for public key encryption, which is based on unproven computational difficulty of certain mathematical functions. These systems have proven to break gradually over time, leading to an increase in the complexity of the systems used to establish a secure communication. The complexity has now reached its limits, hindering communication in terms of speed. We want to introduce quantum cryptography, which is considered inviolable, and one thing the not too distant future. It is based on advanced physics laws such as the quantum properties of certain materials (subatomic particles, photons) to establish a secure way to share a public key. It is still early stage of development with the limitations of dual-channel photon production and recognition. There are many opportunities to study in the field of encryption systems with new algorithms to break the existing record time.
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