Comment by e12e
7 years ago
You'd at least want per record salts. But even then it's trivial to check if a given ip is in the dataset. Better, but not great. (ie: you have access to the dataset, you want to check if a given ip/time match the log - read the salt, check the hash).
But per record hashes break the original use case: checking if a given hash is already in the database.