Cross-Platform Screenshot Capture Tool

I'm developing a Python-based background application that automatically captures screenshots every 5 seconds at fixed intervals across multiple monitors. The app should encrypt the screenshots and store them in a single log file. It must run in the system tray and be resistant to termination by regular users.

Key Requirements:
- US resident with Linkedin
- Supports Windows, macOS, and Linux
- Captures screenshots every 5 seconds
- Encrypts screenshots
- Stores in a single log file
- Runs in system tray
- Difficult to terminate by regular users

Ideal Skills & Experience:
- Proficiency in Python
- Experience with encryption libraries
- Familiarity with cross-platform development
- Knowledge of system tray applications
- Background in security and privacy