Quantum computers have been discussed a lot recently. Many questions of when will they be commercially available have been going around although we still do not release understand the quantum world. However, cryptography has been a huge issue because of quantum computing. It is estimated that we will have access to commercial quantum computers between the next 15 to 30 years.
According to NASA, D wave quantum technology could provide 100 million times faster computing power that current conventional technology. Although this sounds awesome, public key cryptography on the other hand is hanging by a thread. Popular crypto methods such as RSA that are being used worldwide will be broken and no longer useful. In fact, in 1994, Peter Shor has already devised a quantum method to factor large prime numbers but people did not worry due to the lack of quantum computers. It takes times to develop a new cryptography and to test it, therefore if quantum computers are available within the next 15 years, we already have a problem. However, if it becomes available in the next 30 years, we might still have time to generate a solution before all our data becomes readable.