feat: Transition to device-native cryptographically secure random generator

Author: realjck

README.md

@@ -2,7 +2,7 @@
 
 OpenRando is an open-source, web-based alternative to Randonautica that generates unique, random real-world coordinates for you to explore. 
 
-By leveraging true quantum random numbers from the Australian National University (ANU) and applying Kernel Density Estimation (KDE), the application calculates concentrated areas of probability ("attractors") to break your daily routine and send you on an adventure. 🥾🌲✨ 
+By leveraging your device's native Cryptographically Secure Random Number Generator and applying Kernel Density Estimation (KDE), the application calculates concentrated areas of probability ("attractors") to break your daily routine and send you on an adventure. 🥾🌲✨ 
 
 ### 👉 [Launch the App](https://realjck.github.io/OpenRando/)
 
@@ -11,7 +11,7 @@ By leveraging true quantum random numbers from the Australian National Universit
 **Features:**
 - Set your starting location via GPS or by clicking on the map.
 - Choose a search radius between 500m and 5km.
-- Generate quantum-backed destination points.
+- Generate unpredictable true-random destination points.
 - Open the generated coordinates directly in Google Maps. 
 
 Built with React, Leaflet, and Tailwind CSS.

src/App.tsx

@@ -73,19 +73,6 @@ export default function App() {
   const [loading, setLoading] = useState(false);
   const [error, setError] = useState<string | null>(null);
   const [showInfo, setShowInfo] = useState(false);
-  const [cooldown, setCooldown] = useState(0);
-
-  useEffect(() => {
-    let timer: ReturnType<typeof setInterval>;
-    if (cooldown > 0) {
-      timer = setInterval(() => {
-        setCooldown(prev => prev - 1);
-      }, 1000);
-    }
-    return () => {
-      if (timer) clearInterval(timer);
-    };
-  }, [cooldown]);
 
   // Get user location on mount
   useEffect(() => {
@@ -116,10 +103,9 @@ export default function App() {
       const quantumNumbers = await fetchQuantumNumbers();
       const result = calculateAttractor(startPos[0], startPos[1], radius, quantumNumbers);
       setAttractor(result);
-      setCooldown(120);
     } catch (err) {
       console.error("Generation error:", err);
-      setError("Error during quantum generation. Please try again.");
+      setError("Error during generation. Please try again.");
     } finally {
       setLoading(false);
     }
@@ -255,22 +241,22 @@ export default function App() {
 
             <button 
               onClick={handleGenerate}
-              disabled={loading || cooldown > 0}
+              disabled={loading}
               className={`w-full py-4 rounded-2xl font-bold text-lg flex items-center justify-center gap-3 transition-all ${
-                loading || cooldown > 0
+                loading 
                 ? 'bg-zinc-800 text-zinc-500 cursor-not-allowed' 
                 : 'bg-white text-black hover:bg-zinc-200 active:scale-[0.98]'
               }`}
             >
               {loading ? (
                 <>
                   <RefreshCw className="w-6 h-6 animate-spin" />
-                  Quantum Calculation...
+                  Calculating...
                 </>
               ) : (
                 <>
                   <RefreshCw className="w-6 h-6" />
-                  {cooldown > 0 ? `Generate Attractor (${cooldown}s)` : 'Generate Attractor'}
+                  Generate Attractor
                 </>
               )}
             </button>
@@ -302,7 +288,7 @@ export default function App() {
               <h2 className="text-2xl font-bold text-white mb-4">About OpenRando</h2>
               <div className="space-y-4 text-zinc-400 text-sm leading-relaxed">
                 <p>
-                  OpenRando uses quantum random numbers generated by the Australian National University (ANU) to create unique destination points.
+                  OpenRando uses your device's native Cryptographically Secure Random Number Generator to create unique destination points.
                 </p>
                 <p>
                   The principle is to break your daily routine by sending you to areas of high "vibration", calculated by a Kernel Density Estimation (KDE) on 512 quantum points.

src/services/quantumService.ts

@@ -1,5 +1,5 @@
 /**
- * Logic for calculating quantum attractors using ANU QRNG API and Silverman KDE.
+ * Logic for calculating attractors using local CSPRNG and Silverman KDE.
  */
 
 export interface Point {
@@ -20,15 +20,12 @@ const EARTH_RADIUS = 6371; // km
 const ONE_DEGREE = (EARTH_RADIUS * 2 * Math.PI) / 360 * 1000;
 
 /**
- * Fetches quantum random numbers from ANU API.
+ * Generates random numbers using the browser's native CSPRNG.
  */
 export async function fetchQuantumNumbers(length: number = 1024): Promise<number[]> {
-  const response = await fetch(`https://qrng.anu.edu.au/API/jsonI.php?length=${length}&type=uint16`);
-  if (!response.ok) {
-    throw new Error("Failed to fetch quantum numbers from ANU API");
-  }
-  const data = await response.json();
-  return data.data;
+  const array = new Uint16Array(length);
+  globalThis.crypto.getRandomValues(array);
+  return Array.from(array);
 }
 
 /**