Why is proper hashing essential in protecting your users? And what is proper hashing, anyway?
I will talk about various ways of storing users' passwords in a database. I will also show one real world example by using a dumped dataset with several hundred hashed passwords from a small local (Czech) online shop for a major clothing brand. I'll show that it's possible to take over a user's mailbox (including gmail.com mailbox) by cracking passwords from this dataset simply by using an online cracking tool. That is few dozens of active mailboxes in several minutes with just a browser. I will also present some stats from this dataset - how many passwords were successfully cracked by this online tool. I will recommend better hashing algos than just a plain SHA-1. I will also add few tips like "don't send passwords by email".