Add-on Code for Data Classification in Isolated Apps

The system is divided into independent components: the standard application, the add-on code, and the virtual keyboard. Each component performs a specific function - the standard application handles core functionality, the add-on code provides security capabilities, and the virtual keyboard serves as the interaction interface. This segmentation allows the security features to be added without modifying the standard application's internal structure.

The virtual keyboard acts as an intermediary between the user and the data classification system. Instead of directly modifying the standard application's data flow, the add-on code intercepts keyboard input events, processes them through classification logic, and returns modified input to the application. This intermediary approach enables security enforcement without disrupting the application's existing architecture.

The add-on code is designed to work with multiple standard applications through a universal interface - the virtual keyboard protocol. Rather than creating customized solutions for each application, the same add-on code can be installed across different applications to provide classification and encryption capabilities. This multi-functionality reduces development costs and enables broad security enforcement.

Instead of modifying each standard application individually or creating expensive substitute applications, the solution copies the security functionality into a separate add-on module that interfaces through the existing keyboard mechanism. This allows the security capabilities to be replicated across multiple applications without rewriting their core codebases.

The add-on code presents itself as a homogeneous element within the existing virtual keyboard interface. It uses the same input methods, display formats, and interaction patterns as standard keyboards, making it visually and functionally indistinguishable from the native interface. This homogeneity allows users to operate the classification features without noticing any disruption to their familiar workflow.

The virtual keyboard automatically handles the classification process without requiring users to manually configure or understand the underlying security mechanisms. As users type, the add-on code autonomously analyzes input, applies classification rules, and enforces security policies. This self-service approach simplifies operation while the complex classification logic runs automatically in the background.