It is currently possible to attempt a brute-force solution by making a guess and changing it until the mark increases, then guessing for the next entry. The best solution to this is to rate limit users - legitimate users won't notice such a limitation, and it makes the time needed for a brute-force approach to work prohibitively long.
It is currently possible to attempt a brute-force solution by making a guess and changing it until the mark increases, then guessing for the next entry. The best solution to this is to rate limit users - legitimate users won't notice such a limitation, and it makes the time needed for a brute-force approach to work prohibitively long.