by Nth Dimension

Physical security for your personal data

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A physically secure hardware password and personal information manager you can take with you wherever you go.


Signet 2-pack

Two physically secure hardware password and personal information manager you can take with you wherever you go. You can give one Signet to a friend or keep one as a backup device.


USB Extension Cable

Helps keep your Signet close to your keyboard when the closest USB port is too far away. Can also reduce strain on the device's connector to increase its lifespan. 3'

USB Extension Cable


Micro-USB Host Adapter Cable

Connects your Signet to a micro-USB Android device. 6"


USB-C Host Adapter Cable

Connects your Signet to a USB-C Android device. 9"


Recent Updates

As Featured In


"Para asegurar la seguridad de las operaciones sensibles, como el borrado de información, este dispositivo encriptado para guardar contraseñas dispone de un botón físico que debe ser pulsado para confirmar dichas operaciones."

Linux Magazine

"The use of an external device and the exchange of information between the device and the client allows for a number of unique security features."

Signet is a compact, open hardware, and free and open source software USB device that safely stores your passwords, bookmarks, contacts, and other personal data in encrypted memory. It’s compatible with MacOS, Linux, Windows, and Android so you can use it on any device with a USB port. The device is smaller than the average house key, making it easy to take with you wherever you go. This makes Signet a practical alternative to storing sensitive data in the cloud. Unlike cloud-based or proprietary solutions, Signet is fully auditable with no proprietary software, firmware, or binary blobs to potentially hide security flaws.

A Powerful Cross-Platform Application

Access your data through a cross-platform application that unlocks your data with your master password. Once unlocked, Signet acts as both a password manager and a general personal information database. Signet acts as a USB keyboard to allow you to easily enter data into web forms. Signet can also type both a username and password to log you into a website instantly. The application features an intuitive graphical interface as well as keyboard based navigation to enable you to perform common tasks quickly.

Browser plugin support

We have produced browser plugins for Chrome and Firefox. The plugin operates by communicating with the Signet client over a local communications channel. The browser plugin icon will display a green circle whenever you are on a site that your Signet has login information for. When activated the plugin will fill in the username and password for the website and press the login button.

Easily Access Your Data Anywhere

On desktop operating systems (Windows, GNU/Linux, MacOS), the Signet application software can run as a standalone executable with no driver installation needed, allowing you to quickly access your data at new locations. If you’re away from a computer, you can still access your data on your Android device through a USB host adapter cable.

Physical Security for Peace of Mind

Unlike pure software solutions, Signet protects your data from any hostile software on the systems you use. Signet will not transmit, modify, or destroy any data without the command being confirmed by a button press when the device flashes. This physically secures the device because only the user can press the device’s button. No system’s security is absolute, but physically requiring a button press to confirm sensitive operations increases the complexity and decreases the potential effectiveness of any attack.

Flexible Data Storage

Signet’s personal information database allows you to store whatever data you might want to keep with you and possibly off the cloud. It features built-in types for contacts, bookmarks, credit cards, and miscellaneous account numbers. You can add new data types to the database so you can keep track of whatever else is important to you and you can add fields to individual entries for notes and related data.

Personal Data Backups

Keeping your Signet with you comes with the risk of losing the device. You can configure Signet to regularly back up your data when connected to your primary computer, to either your computer’s hard disk or a designated removable media device such as a USB stick or memory card. The Signet client can then read the backups when you provide the master password, giving you immediate access to your data and the option to upload the data to a replacement device.

To give you full control over your data the Signet application supports conversions between Signet’s internal database format and other popular formats. It currently supports import of login and other information from KeePass databases, pass databases, and CSV files. It supports exporting to unenecrypted formats such as CSV files. Additional importers and exporters are added regularly.

Who Needs It and Why?

Signet is for anyone who wants the portability and convenience of storing passwords and other sensitive data on the cloud without having to trust closed source software or the security of third-party networks.

Signet could be useful to anyone who has:

  • Reused passwords in order to have fewer to remember and has had to change passwords on many accounts because one account was compromised.
  • Wanted to store private information (such as Social Security numbers) on their person but hesitated because of the risks of the information being stolen.
  • Resorted to using simplistic passwords to make them easy to remember despite the risks of password cracking.
  • Needed to access sensitive data (passwords, credit cards, account numbers, etc) on multiple computers outside their home (school, work, etc).
  • Wanted to move away from using hand written notes and stray text files for remembering important data and switch to using a self-contained digital system.

Features & Specifications

  • Dimensions: 46 mm x 18 mm x 10.5 mm
  • Compatibility: Windows, Linux, MacOS, Android
  • Firmware Software License: GPLv3 (
  • Client Software License: GPLv3 (
  • KiCAD Files License: CC-BY-3.0 (
  • Enclosure: Injection molded ABS plastic fastened with a screw and an external snap
  • Microcontroller: STM32L442 Cortex M4 processor
  • Database Capacity: 192 KB. Enough space for thousands of data fields
  • Database Storage Type: On-chip flash memory
  • Encryption Method: AES-256 with cypher block chaining
  • Encryption Key Derivation: SCrypt hash function with a per-device randomized salt
  • Firmware Program Size: 64 KB


Open sourceNon-password dataCostPhysical portability Physical securityOffline
Signet Yes Yes $45High Yes Yes
MooltipassYes No $79Limited Yes Yes
KeePassYes No FreeN/ANo Yes
LastpassNo Yes $12/yearN/ANo No

Demonstration Videos

Learn about Signet’s implemenation and features from these videos.

Password Management

Browser plugin operation

Device Management

Support & Documentation

Please check Nth Dimension’s website for technical support and documentation.


Nth Dimension

Producer of privacy and security focused open source electronics.

Neils Nesse


Jason Onada

Mechanical Designer


Contract manufacturer

Screaming Circuits

Contract Manufacturer


Injection Molding Manufacturer

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