Security keys you create by rolling dice
Don't let your own security lock you out
DiceKeys are backup security keys that prevent lockouts and make it easier to adopt stronger online security.
Use password managers without memorizing ‘master’ passwords
Create FIDO security keys you can replicate if broken or lost
Ensure ongoing access to the data in end-to-end encrypted apps

Now available for pre-orders

Order via our friends at Crowd Supply

Reliable and trustworthy by design

Readable by your devices and your own eyes
DiceKeys can be read by most any phone, tablet, or computer.
Or, you can use your own eyes to read each face by its:
  • letter, which identifies the die
  • digit, which identifies the face of the die, and
  • orientation (rotation) of the face relative to the box
The lines and dots are error-correction codes. Each line contains a redundant encoding of the letter and digit on the face of the die. Our algorithms use them to orient and double check the letter and digit.
Open and tangible
Our open software for reading DiceKeys and performing cryptographic operations with them is available for you to inspect, compile, modify, and use for eternity.
In contrast to hardware designed to resist inspection, you can inspect every aspect of DiceKeys with your own eyes. Your security is literally in your own hands.
Designed to last a human lifetime
Most products are designed to be replaced, and many technology products are designed to be replaced dozens of times over a human lifetime. In contrast, one need only open up a decades-old game to observe the longevity of dice.
In 50 years, our devices may no longer support Bluetooth or USB-C, but we will still have eyes and our devices will still have cameras. Even if the company behind
is long gone, our license gives you access to use our software for eternity, and allows the open-source community to maintain and improve it.

Presentations and video demos

Hardware availability

Our first shipment of DiceKeys are available for pre-order from Crowd Supply paired with a SoloKey , so that you can seed the SoloKey from your DiceKey and replace the SoloKey with a cryptographically-identical replica if you break or lose it.

Partners, developers, and members of the press can contact us for test units, which have completed manufacturing are en route to our distributor.


Use the DiceKeys app (https://dicekeys.app) to read your  DiceKey. Our API allows apps and services to derive their own private secrets from your  DiceKey without seeing the key itself.

Our reference implementation runs in most modern web browsers, allowing it to work on an incredibly diverse range of devices. While built with web-based technologies (TypeScript & WebAssembly), it runs entirely locally on your device.

We are also developing Android and iOS versions to provide a richer experience on those devices.


Stuart's career as an inventor and researcher in the field of usable security research spanned his years at Microsoft Research, MIT Lincoln Laboratory, and his PhD at Harvard University. He currently teaches Usable Privacy and Security for the University of California at Berkeley's Master's Program in Cybersecurity.


Joseph Bonneau is an Assistant Professor at NYU and was formerly affiliated with Stanford, Princeton, Cambridge (PhD), the Electronic Frontier Foundation, Google, Yahoo, and Cryptography Research. He is known for groundbreaking work on authentication, including analysis of 70m passwords at Yahoo, and for his security analyses of cryptocurrencies. Of particular relevance for DiceKeys, he created the word lists for EFF's DiceWare, a technology to help users to create phrase-based passwords from standard dice.
Bruce Schneier is an internationally renowned security technologist, called a "security guru" by The Economist. He is the author of over one dozen books--including his latest, Click Here to Kill Everybody--as well as hundreds of articles, essays, and academic papers. His influential newsletter "Crypto-Gram" and his blog "Schneier on Security" are read by over 250,000 people. He has testified before Congress, is a frequent guest on television and radio, has served on several government committees, and is regularly quoted in the press. Schneier is a fellow at the Berkman Klein Center for Internet & Society at Harvard University; a Lecturer in Public Policy at the Harvard Kennedy School; a board member of the Electronic Frontier Foundation, AccessNow, and the Tor Project; and an Advisory Board Member of the Electronic Privacy Information Center and VerifiedVoting.org.

Technical specs

Security strength
25 unique dice (letters) assigned to 25 positions
6 possible faces (digits) exposed by each die
× 625
4 possible orientations of each exposed face
× 425
4 possible orientations of box reduced to one*
/ 41
=2196 + ε
>196 bits

*To generate secrets consistently even if you scan your DiceKey sideways or rotated up-side down, our software rotates your DiceKey to a canonical orientation before deriving secrets from it.

Physical Properties (edition 2020.0)

Die size: 12mm
Mass (25 dice, 3-part box, and bag): ≈103 grams