isTrusted

1. What is the isTrusted Property

The isTrusted property is a boolean attribute of DOM events that indicates whether:

1. Origin - The event was generated by genuine user interaction (true) or programmatically via JavaScript (false)
2. Security Boundary - Serves as a security measure against synthetic event injection
3. Read-only - Cannot be modified through standard JavaScript APIs

Key event types with this property:

• MouseEvent (clicks, movements)
• KeyboardEvent (key presses)
• TouchEvent (mobile interactions)
• SubmitEvent (form submissions)

2. How Platforms Detect Synthetic Events

Platforms use isTrusted alongside other heuristics to detect automation:

1. Direct Check:

element.addEventListener('click', (e) => {
  if (!e.isTrusted) { /* Flag as automated */ }
});

2. Behavioral Patterns:

• Unrealistically fast sequential events
• Events without preceding mouse movements
• Identical timestamp events

3. Ancillary Indicators:

• Missing hardware signatures (pointer pressure, screen coordinates)
• Absence of related events (e.g. mousedown before click)
• Non-human timing distributions

4. Cross-verification:

• Comparing isTrusted with:
  • Event.timeStamp
  • PointerEvent.pressure
  • MouseEvent.screenX/Y consistency

3. How FlashID Simulates Trusted Events

FlashID employs advanced techniques to generate events indistinguishable from user interactions:

1. Native Event Injection:

• Uses browser debugging protocols to inject events at OS level
• Mimics hardware event signatures (pressure, coordinates)

2. Event Sequence Simulation:

• Generates realistic pre-event movements
• Maintains human-like timing between:
  • Mousedown → Mouseup → Click (150-300ms)
  • Keydown → Keypress → Keyup (50-120ms)

3. Environment Synchronization:

• Aligns synthetic events with actual hardware metrics
• Maintains consistent:
  • Screen resolution awareness
  • Pointer acceleration profiles
  • Touch/click position distributions

4. Dynamic Behavior Modeling:

• Implements randomized micro-movements
• Simulates hand tremor (0.5-1.5px jitter)
• Varies pressure/time based on:
  • Session duration fatigue patterns
  • UI element positioning
  • Previous interaction history

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