diff --git a/backend/RESTful API/Program.cs b/backend/RESTful API/Program.cs
index 7edbabe..f54369c 100644
--- a/backend/RESTful API/Program.cs	
+++ b/backend/RESTful API/Program.cs	
@@ -16,8 +16,12 @@
 var builder = WebApplication.CreateBuilder(args);
 
 // Configurar JWT
-var key = Encoding.ASCII.GetBytes(
-    builder.Configuration["JwtSettings:Secret"] ?? "chave-super-secreta");
+var jwtSecret = builder.Configuration["JwtSettings:Secret"];
+if (string.IsNullOrEmpty(jwtSecret) || jwtSecret == "YOUR_JWT_SECRET_KEY_HERE_MIN_32_CHARS" || jwtSecret.Length < 32)
+{
+    throw new InvalidOperationException("A valid JWT Secret must be configured in JwtSettings:Secret. The secret must be at least 32 characters long and not the default placeholder.");
+}
+var key = Encoding.ASCII.GetBytes(jwtSecret);
 
 // Connection string
 var connectionString = builder.Configuration.GetConnectionString("DefaultConnection");
diff --git a/backend/RESTful API/appsettings.json b/backend/RESTful API/appsettings.json
index 9f59bc9..bc6a6ed 100644
--- a/backend/RESTful API/appsettings.json	
+++ b/backend/RESTful API/appsettings.json	
@@ -8,7 +8,7 @@
   "AllowedHosts": "*",
 
   "JwtSettings": {
-    "Secret": "S3gr3d0SuperSeguroComMaisDe32Caracteres"
+    "Secret": "YOUR_JWT_SECRET_KEY_HERE_MIN_32_CHARS"
   },
 
   "ConnectionStrings": {