There are multiple users who, post-breach, are checking the Iteration Count the number of PBKDF2 iterations for their vault, and discovering that even though LastPass had been slowly increasing the number of iterations for new customers in line with industry best practices, they were never going back and upgrading the old users. So if you created a LastPass account in the past few years, your iteration count was 100,000. But if you were an older user, it may have only been 5,000. Or 500. Or, in the case of many old users: 1. One iteration. That's all that was protecting their encrypted vault--now in the hands of attackers--from brute forcing.