Signet App 4+

Trust and Privacy in messaging

Signet Digital Oy

    • Free



The Signet App is a security application for rapid and inexpensive deployment of confidential and secured communications. User can deploy the app on common Commercial Off-The-Shelf (COTS) mobile devices. The Signet App can be used for securing content with common communication methods, such as instant messaging apps or email, which cannot otherwise be considered secure.

You can exchange a contact in the Signet App over a short range Bluetooth connection when meeting your trusted contact in person. You can then secure any content in your mobile device to your listed contacts, and send the secured content over any other app that can deliver a file to your contact. Signet App itself does not have any means of communicating over the Internet.


Contact book

* Exchange contact information over short range bluetooth when meeting your trusted contact in person
* Create groups of the contacts in your contact book
* Share a group to its members

Securing and Delivering content

* Write a message
* Take a photo
* Record an audio file
* Import any other content from your mobile device
* Share content to Signet App from another application
* Select recipients for securing the content
* Secure the content for the selected recipients
* Share the secured content over any other messaging apps that supports sending a file

Secured data storage

* Encrypt your created or imported data to securely store it in your mobile device
* Preview the content stored in Signet Keep
* Select the content for securing and sending it to recipients


Signet App employs the best available security capabilities of your mobile device. The content stored in the Signet Keep is secured by Apple Secure Enclave backed file protection. The encrypted Signet Message file is protected using Secure Enclave backed keys.

The cryptographic keys used in the Signet App are strictly tied to your physical device and secured by the biometric authentication provided by the iOS platform. There is no way to recover any data or keys from a backup to another physical device!

All cryptographic ciphers and functions employed in the Signet App are provided by the iOS internal CryptoKit and CommonCrypto libraries. No custom or 3rd party cryptographic implementations are used in the Signet App.


What’s New

Version 1.2.4

Bug fixes to contact and group pages.

App Privacy

The developer, Signet Digital Oy, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy.

Data Not Collected

The developer does not collect any data from this app.

Privacy practices may vary, for example, based on the features you use or your age. Learn More

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