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5. Security Implications

NFR‑001

| ID | Requirement | Details | |----|-------------|---------| | | Performance | Opening a 500 KB profile < 200 ms; re‑signing < 500 ms on a typical laptop. | | NFR‑002 | Cross‑Platform | Works on Windows 10/11, macOS 12+, major Linux distros (Ubuntu 20.04+, Fedora). | | NFR‑003 | Usability | UI follows Material Design (or native OS look) with keyboard shortcuts ( Ctrl+S to save, F5 to validate). | | NFR‑004 | Reliability | No data loss – every operation writes to a temporary file first, then atomically renames. | | NFR‑005 | Security | All crypto uses Node’s built‑in crypto module or OpenSSL (bundled). Private keys are stored only in memory; never written to disk unless the user explicitly exports them. | | NFR‑006 | Extensibility | Plug‑in architecture for future payload types (e.g., com.apple.managedClient ). | | NFR‑007 | Documentation | Full user guide (HTML/Markdown), API reference for CLI, and code comments for developers. | | NFR‑008 | Testing | Unit tests > 90 % coverage for parser, validator, and signer. End‑to‑end tests on Windows/macOS CI pipelines. | | NFR‑009 | Accessibility | UI supports high‑contrast mode, screen‑reader labels, and keyboard navigation. | | NFR‑010 | Internationalisation | UI strings externalised; ready for English + Vietnamese (the primary CHPlay market). |

• For Android, consider sideloading apps via APK downloads from trusted developers (e.g., GitHub).
• Use free trials or demo versions offered by legal platforms.