When is it safe to use a broken hash function?

Question

It is trivial to use a secure hash function like SHA-256, and continuing to use MD5 for security is reckless behavior. However, there are some complexities to hash function

Answer 1

The only time it is safe to use a broken hash function is when the consequences of a collision are harmless or trivial, e.g. when assigning files to a bucket on a filesystem.