Check the online version, I often update my slides.

Talk detail

Why is proper password hashing essential in protecting your users? And what is proper hashing, anyway?

I was talking at the Passwords13 Las Vegas, USA, a conference focused only on passwords & PIN codes, about various ways of storing users' passwords in a database. I was the first web developer ever to speak at this conference.

I also presented 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 demonstrated that it's possible to take over user's mailbox (including a mailbox with additional protection) 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 presented some stats gathered while working with this dataset – how many passwords were successfully cracked by this online tool and how many were additionally cracked using a tool called hashcat on a regular laptop. I recommended better hashing algos than just a plain SHA-1, like scrypt and bcrypt. As a bonus I added few tips like don't send passwords by email.

Interested in password storage and web security in general? Come to my web application security training (next date: termín zatím nevypsán) or e-mail me.

Date and event

July 30, 2013, Passwords13 Las Vegas (video)



Video recording


Michal Špaček

Michal Špaček

I build web applications and I'm into web application security. I like to speak about secure development. My mission is to teach web developers how to build secure and fast web applications and why.

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