The security of public-key cryptography is entirely dependent on the difficulty of solving math problems that historically have been extremely difficult for conventional computers to solve.
Quantum computing changes that. In fact, the types of math problems that are the foundation of public-key cryptography are precisely the kinds of problem that quantum computing is excellent at solving.
In contrast, the security in symmetric cryptography is entirely based on the use of random numbers for symmetric keys. Fortunately, quantum computers will never have a significant advantage in executing a “brute-force” attack on symmetric keys — in other words, quantum computers do not have an advantage in searching through all possibilities for random symmetric keys.
Symmetric cryptography is incredibly strong. Want to learn just how strong Cord3’s symmetric cryptography is? Click here.