Password security is 1% choosing a half-decent password, 99% not using it anywhere else

Posted by   Martijn Grooten on   Jul 18, 2017

It is a truth generally acknowledged that there is no such thing as absolute security. Security is always a compromise with usability, and good security is about finding the right kind of compromise for the particular threat model you're defending against.

Password security is a good example. Ideally, one should use a very strong unique password for every account and then make sure one remembers them all. In practice, this would require superhuman capabilities.

To compromise on these unworkable requirements, many people drop the uniqueness element and use the same, very strong password for all their online accounts and then make sure they memorise it. To security experts the dangers of this are obvious, and an article in the Sunday Telegraph showed how costly this can be, but is our advice helping users?

There are many websites and blog posts that explain how to choose a secure password, and while they tend to give sensible advice they often miss the most important point: barring obvious choices such as '123456' or 'password', the strength of a password plays a role in only a very limited number of attacks. Rather, password reuse or (and often combined with) phishing attacks play a much bigger role. The strength of John Podesta's password stopped mattering the moment he entered it into Fancy Bear's phishing page.

Although two-factor authentication (2FA) is again no silver bullet, and may not have deterred attackers of Fancy Bear's capabilities, it raises the bar for attackers significantly. For this reason, it should be used on accounts that matter, even if the only 2FA option uses SMS, which we know has been broken, it's still much better than using only a password.

Next to using 2FA wherever possible, a password manager can help you manage strong and unique passwords for all your accounts: putting all but the most important passwords in such a tool can take away most of the pain of managing passwords.

Password managers do come with an important weakness though: a single point of failure through which an adversary can access all your passwords if they manage to obtain your master passwords. For most accounts that is an acceptable risk, but if you think it isn't, maybe you are able to memorise a few dozen half-decent passwords. If it would help you, writing them down in a notebook isn't as bad an idea as it is purported to be against most (but not all!) adversaries. Just don't ever reuse them!


There are plenty of sites where you can check the strength of your password. But shouldn't these have a tickbox where you need to state you're not using the password anywhere else?



Latest posts:

VB2018 video: The Big Bang Theory by APT-C-23

Today, we release the video of the VB2018 presentation by Check Point researcher Aseel Kayal, who connected the various dots relating to campaigns by the APT-C-23 threat group.

VB2019 London - join us for the most international threat intelligence conference!

VB calls on organisations and individuals involved in threat intelligence from around the world to participate in next year's Virus Bulletin conference.

VB2018 paper: Tracking Mirai variants

Today, we publish the VB2018 paper by Qihoo 360 researchers Ya Liu and Hui Wang, on extracting data from variants of the Mirai botnet to classify and track variants.

VB2018 paper: Hide'n'Seek: an adaptive peer-to-peer IoT botnet

2018 has seen an increase in the variety of botnets living on the Internet of Things - such as Hide'N'Seek, which is notable for its use of peer-to-peer for command-and-control communication. Today, we publish the VB2018 paper by Bitdefender…

New paper: Botception: botnet distributes script with bot capabilities

In a new paper, Avast researchers Jan Sirmer and Adolf Streda look at how a spam campaign sent via the Necurs botnet was delivering the Flawed Ammyy RAT. As well as publishing the paper, we have also released the video of the reseachers' VB2018…

We have placed cookies on your device in order to improve the functionality of this site, as outlined in our cookies policy. However, you may delete and block all cookies from this site and your use of the site will be unaffected. By continuing to browse this site, you are agreeing to Virus Bulletin's use of data as outlined in our privacy policy.