When you search to a website or attach to a VPN, you use a public essential formula to agree on a secret. Usual public key formulas are RSA, Diffie Hellman and Elliptic Curve Diffie Hellman. These formulas count on difficult maths problems to ensure that an eavesdropper can not exercise your trick. The problem is that all of these issues can be broken easily by a quantum computer system, which basically threatens the security of the internet and also various other communications systems.