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Editors' Review · October 14, 2026

Secure PDF Signing and Authentication App

Sub Rosa is an innovative Android application tailored for professionals requiring secure document handling and authentication on-the-go. This productivity tool enables users to digitally sign and edit PDF and XFA documents through a smart card, necessitating a compatible PKard Reader. The free version offers essential features such as sending signed and encrypted emails, accessing PIV/CAC protected websites, and managing OWA calendars, all from mobile devices. Its user-friendly interface simplifies complex tasks, making it suitable for users who need to maintain productivity without the hassle of bulky laptops during travel.

The app employs a robust two-factor authentication system that leverages US Government CAC or PIV smart cards for secure logins, ensuring data integrity and security. Sub Rosa adheres to industry standards, enhancing compatibility across various smart card types. The subscription model unlocks additional features for PDF signing, while its support for USB host mode devices significantly expands its functionality. Overall, Sub Rosa is a powerful tool for secure access and document management, making it a top choice among similar applications.

Enlarged image for Sub Rosa
Sub Rosa 0/1

Technical

Title
Sub Rosa 5.1.4 for Android
Requirements
Android 13.0
License
Free
Latest update
Author
Thursby Software Systems LLC
SHA-1
7295bb9ce8320bfc485f5ee9aa020065314b0596
Filename
com-thursby-pkard-subrosa-basic-2063-64617474-e667c80c74035c6c3bb6567170045e91.apk

Also available in other platforms

Program available in other languages



Changelog

We don’t have any change log information yet for version 5.1.4 of Sub Rosa. Sometimes publishers take a little while to make this information available, so please check back in a few days to see if it has been updated.

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