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Quantum computing could render some of our current methods insecure and obsolete, while enabling new methods. Quantum computing may enable the secure exchange of information, even in the presence of quantum computers. Current methods include cryptography, hashing and requiring the solution of math problems that demand enormous computing power.Quantum computing will likely be able to break any encryption and hashing algorithms easily. It could also impact the integrity of blockchains and blockchains. Quantum computers could also be used to encrypt messages and send quantum states of light to the recipient.