View all newsletters
Receive our newsletter - data, insights and analysis delivered to you

Students copy high security prison keys with 3D printing

The keys can be replicated for as little as $5 each.

By Duncan Macrae

MIT students who demonstrated how keys for high-security Primus locks can be duplicated by 3D printers have suggested the printers be made illegal.

Presenting at the Defcon hacker show this weekend, Eric Van Albert and David Lawrence released a piece of code that enables anybody to produce a 3D printable software model of any Primus key – the kind used with prison cell locks – despite lock maker Schlage’s attempts to prevent the duplication.

With their software tool and a flatbed scanner, the students were able to create precise copies that they uploaded to 3D printing services i.Materialise and Shapeways, which posted them working copies of the keys in nylon and titanium.

Van Albert said: "In the past if you wanted a Primus key, you had to go through Schlage. Now you just need the information contained in the key, and somewhere to 3D print it.

Lawrence noted: "You can take a high security ‘non-duplicatable’ key and basically take it to a virtual hardware store to get it copied."

The researchers warn that, at the very least, high-security institutions should move to electronic locks that use unique cryptographic keys, which are more difficult to copy.

Van Albert commented: "If we show that mechanical locks are vulnerable to key duplication just by having a handful of numbers you can download off the internet, hopefully they ‘ll be phased out more quickly."

Content from our partners
DTX Manchester welcomes leading tech talent from across the region and beyond
The hidden complexities of deploying AI in your business
When it comes to AI, remember not every problem is a nail

"Either that, or make 3D printers illegal," added Lawrence.

Lawrence and Van Albert managed to decipher the two distinct codes in the keys – one set of six numbers cut into the top of the key and another set of five in its sidecut – by studying Schlage’s manuals and patents. The codes could then be programmed into their modelling software and reproduced accurately.

Lawrence explained: "All you need is a friend that works there, or to take a picture of their key, or even a picture of the key hanging off their belt. Pirating keys is becoming like pirating movies. Someone still has to get the information in the first place, but then everyone can get a copy."

Once a key has been photographed or scanned, online 3D printing services are not expensive. The MIT students used Shapeways to print working keys in nylon for less than $5 each, and a more durable titanium copy from cost $150.

Websites in our network
Select and enter your corporate email address Tech Monitor's research, insight and analysis examines the frontiers of digital transformation to help tech leaders navigate the future. Our Changelog newsletter delivers our best work to your inbox every week.
  • CIO
  • CTO
  • CISO
  • CSO
  • CFO
  • CDO
  • CEO
  • Architect Founder
  • MD
  • Director
  • Manager
  • Other
Visit our privacy policy for more information about our services, how Progressive Media Investments may use, process and share your personal data, including information on your rights in respect of your personal data and how you can unsubscribe from future marketing communications. Our services are intended for corporate subscribers and you warrant that the email address submitted is your corporate email address.