 the use of rainbow tables. I'm sorry, for our listeners that don't know what a rainbow table is, it's like a reverse hash, right? So when you create a hash of a password, it's a one-way cryptographic function. It creates this long string of numbers and letters. Rainbow hash is, I'm sorry, rainbow table is just this long list of pre-created hashes that you're going to try to match against in order to crack a password.