Sub Rosa

Offers in-app purchases

**NEW** Sub Rosa is now a PDF signing and editing app! Our new in-app subscription purchase allows for PDF and XFA documents to be signed digitally using your smart card.

Sub Rosa for Android is for use only with one of the bundled micro-USB, USB-C, or case readers in the PKard Reader family. If you are not using a bundled Thursby PKard Reader you need **Sub Rosa Pro** for Android.

With Sub Rosa you can send signed and encrypted emails, access PIV/CAC protected websites and sign PDFs from your Android phone or tablet. Sub Rosa is free when used with one of the bundled micro-USB, USB-C, or case readers in the PKard Reader family. With Sub Rosa you will no longer need to lug your heavy laptop, tangled charger, and clunky card reader with you on trips.

Our Android PKard Reader bundles can be found here:

Sub Rosa is a strong, two-factor CAC/PIV secure authentication agent and web browser that coordinates reader and card access on your Android phone or tablet. Sub Rosa provides full access to your OWA calendar. Allowing you to view, create, and respond to events from your phone or tablet.

You can find out more about the app here:

How does it work?

Instead of a username and password, Sub Rosa uses US Government CAC or PIV smart cards and PINs with authentication to a micro-USB card reader accessory or derived credential. This authentication allows you to log-in to two-factor websites and sign, encrypt, and decrypt email. It also gives you full access to calendaring, which makes managing and coordinating meetings easier than ever.

Thursby is the market leader in secure Apple and Android Department of Defense (DoD), government, and highly regulated enterprise integration, delivering the security features absent in native Android, Apple, and generic enterprise tools. Thursby is US owned and operated, and General Services Administration (GSA) listed, delivering innovative Apple and Android products and services for over a quarter century.

US technical and commercial support is by real people over the phone and by email from Arlington, Texas. Please contact us via, or +1 (817) 478-5070. Please visit for FAQs, guides, and other helpful information.

Supports industry and US Government standards including ISO 7816, NIST IR 6887, HSPD-12, OMB-11-11, FIPS 140-2 and FIPS 201 (with an approved reader). Most popular smart card types are supported including CAC, Dual Persona CAC, PIV, and PIV-I.

** NOTES **
• Subscription based feature allowing PDF and XFA documents to be digitally signed using your smart card
• Device must support USB host mode or On-The-Go (OTG). You can find a list of known compatible devices here:
• Perceived performance depends on Wi-Fi or cell bandwidth, internet “weather” and back-end data center or cloud infrastructure
• Sub Rosa is an integral part of the PKard Toolkit for Android secure app development and policy management ecosystem
• The Google Play app is an individual/consumer distribution, custom builds are available for organizations
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What's New

Fixed an issue where you may not be able to send an encrypted email.
Read more

Additional Information

September 9, 2020
Current Version
Requires Android
7.0 and up
Content Rating
Interactive Elements
Unrestricted Internet
In-app Products
$9.99 - $59.99 per item
Offered By
Thursby Software Systems, LLC
4901 S. Collins St. Arlington, Texas 76018
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