Q. Is a combination lock secure for a house?

Answer

Combination locks are handier than key locks, but they don't provide the same amount of security. Importantly, padlocks with a combination are not as safe as those with a key. Keep in mind that there are no combination padlocks that have passed any sort of security evaluation. The primary flaw of combination locks is its susceptibility to being broken by the user's own trial and error. If a lock has three dials and each dial can only be turned from zero to nine, then the possible combinations are limited to 720. The more knobs it has, the more trial and error will be required to figure it out.