The keys that the World uses today are mainly the Public Private Key system. This form of key distribution will get hacked by Quantum Computers, which are around the corner.
ArQit is fixing the key problem by using Quantum Key Distribution. This uses the quantum properties of photons to create unique keys that can be shared between two parties in laser transmissions from a satellite. This is unhackable, but the world also needs to improve the lockbox. Many people, helpfully, are working on new algorithms, but no algorithm can ever be provably secure, a description that we CAN apply to QKD.