diff --git a/DigitalData.Core.Security/Cryptographer/RSACryptographer.cs b/DigitalData.Core.Security/Cryptographer/RSACryptographer.cs
index b7b15c7..163d4bf 100644
--- a/DigitalData.Core.Security/Cryptographer/RSACryptographer.cs
+++ b/DigitalData.Core.Security/Cryptographer/RSACryptographer.cs
@@ -30,15 +30,20 @@ namespace DigitalData.Core.Security.Cryptographer
 
         internal RSACryptographer() { }
         
+        public virtual void FileNotFoundEvent() => throw new FileNotFoundException(
+            $"Pem is not initialized and pem file is not found in {PemPath}. Issuer is {Issuer} and audience {Audience}.");
+
         // TODO: make file read asynchronous, consider multiple routing
         public virtual void Init()
         {
             if(_pem is null)
             {
+                if(PemPath is null)
+                    throw new InvalidOperationException($"Pem is not initialized and pem file is null. Issuer is {Issuer} and audience {Audience}.");
                 if (File.Exists(PemPath))
                     _pem = File.ReadAllText(PemPath);
                 else
-                    throw new FileNotFoundException($"Pem is not assigned. Furthermore Pem file is not found in {PemPath}. Issuer is {Issuer} and audience {Audience}.");
+                    FileNotFoundEvent();
             }
         }
     }