True, but with the advent of quantum computing, encryption is worthless, at all levels. There exists, already, a 512 qubit computer (D-Wave). It can take a, traditionally, several year problem and arrive at a solution in seconds by exploring multiple solutions simultaneously. A 2048 qubit model is rumored to be commercially available by next year - that's not 4x the speed, it's exponentially faster in an order of magnitude in the tens of millions). What is already built and operational in the NSA data center in Utah would, likely, put these to shame. 256, 512, 1024 encryption keys - these would take fractions of a second to defeat.
A really simple encryption method, so simple it can be done by hand, cannot cracked, even using quantum computers: One-time Pad