Ultimate Security - Quantum cryptography

In the end, all the leading edge services from emerging technologies can be commercialized or
publicly used if and only if the security issues are overcome.
I think quantum cryptography is ultimate solution.
When evesdropper invade or intercept the message, the information is broken and also informs the fact to the Allice & Bob.

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"Quantum cryptography" from wikipedia

Quantum cryptography is an approach to securing communications based on certain phenomena of quantum physics. Unlike traditional cryptography, which employs various mathematical techniques to restrict eavesdroppers from learning the contents of encrypted messages, quantum cryptography is focused on the physics of information. The process of sending and storing information is always carried out by physical means, for example photons in optical fibres or electrons in electric current. Eavesdropping can be viewed as measurements on a physical object — in this case the carrier of the information. What the eavesdropper can measure, and how, depends exclusively on the laws of physics. Using quantum phenomena such as quantum superpositions or quantum entanglement one can design and implement a communication system which can always detect eavesdropping. This is because measurements on the quantum carrier of information disturb it and so leave traces.
Some commercially-available products have appeared based on quantum cryptography, for example, ID Quantique or MagiQ.