Sub Rosa is a productivity application designed for Android users that facilitates secure authentication and PDF signing. It allows users to digitally sign and edit PDF and XFA documents using a smart card, provided they have a compatible PKard Reader. With its free version, users can send signed and encrypted emails, access PIV/CAC protected websites, and manage their OWA calendar directly from their mobile devices. The app eliminates the need for bulky laptops during travel, making it a convenient tool for professionals who require secure access on the go.

This app operates on a two-factor authentication system, utilizing US Government CAC or PIV smart cards for secure logins. Sub Rosa supports industry standards, ensuring compatibility with various smart card types. The subscription model enhances its capabilities, particularly for PDF signing, while the compatibility with USB host mode devices broadens its usability. Overall, Sub Rosa stands out as a robust solution for secure document handling and mobile access to essential services.