I was under the impression that even these are vulnerable, because both MD5 and SHA1 are computationally efficient, meaning you really should be iterating the h

I was under the impression that even these are vulnerable, because both MD5 and SHA1 are computationally efficient, meaning you really should be iterating the hashing process many times over, or using something like blowfish. Also, I think MD5 has collision problems? Which really just brings us to our final solution, which is use a system that is designed by others and has been thoroughly tested and trusted.