Intel 'Downfall': Severe flaw in billions of CPUs leaks passwords and much more

our current public key encryption will be broken. symmetric encryption will be fine

absolutely. a lot of currently in use public key schemes may be broken with those. more recently there have been a few newer algorithm such as kyber that do have a chance to hold. think NIST is also holding a bit of a competition, but dont quote me on that. i really dont know alot about post-quantum crypto

I'll see your quantum computers and raise you electronic analog computers.