diff --git a/SoftU2FTool/UserPresence.swift b/SoftU2FTool/UserPresence.swift
index 7beaf5e..92fb99a 100644
--- a/SoftU2FTool/UserPresence.swift
+++ b/SoftU2FTool/UserPresence.swift
@@ -7,6 +7,7 @@
 //
 
 import Foundation
+import LocalAuthentication
 
 class UserPresence: NSObject {
     enum Notification {
@@ -63,6 +64,37 @@ class UserPresence: NSObject {
 
     // Send a notification popup to the user.
     func test(_ type: Notification) {
+        if #available(OSX 10.12.2, *) {
+            let ctx = LAContext()
+            
+            if ctx.canEvaluatePolicy(.deviceOwnerAuthenticationWithBiometrics, error: nil) {
+                ctx.localizedCancelTitle = "Cancel"
+                ctx.localizedFallbackTitle = "Skip TouchID"
+
+                var prompt: String
+                switch type {
+                case let .Register(facet):
+                    prompt = "register with " + (facet ?? "site")
+                case let .Authenticate(facet):
+                    prompt = "authenticate with " + (facet ?? "site")
+                }
+                
+                ctx.evaluatePolicy(.deviceOwnerAuthenticationWithBiometrics, localizedReason: prompt) { (success, err) in
+                    guard let lerr = err as? LAError else {
+                        self.complete(success)
+                        return
+                    }
+                    
+                    switch lerr.code {
+                    case .userFallback:
+                        self.sendNotification(type)
+                    default:
+                        self.complete(false)
+                    }
+                }
+                return
+            }
+        }
         sendNotification(type)
     }