QC don't "brute-force", that's an inaccurate description of how they work. But to answer your question, yes, it is possible to have classical computers with cry

QC don't "brute-force", that's an inaccurate description of how they work. But to answer your question, yes, it is possible to have classical computers with crypto that withstand QC attacks. There's a whole research field on postquantum crypto, e.g. have a look at http://pqcrypto.eu.org/ http://pqcrypto.eu.org/