diff --git a/src/main/java/StreamAesUtils.java b/src/main/java/StreamAesUtils.java
index 14bf6bc..14dcf8e 100644
--- a/src/main/java/StreamAesUtils.java
+++ b/src/main/java/StreamAesUtils.java
@@ -19,21 +19,21 @@ public class StreamAesUtils {
         if (!hashMap.containsKey("nonce")) {
             return null;
         }
-        System.out.println("cipher=" + (hashMap.get("cipher")));
-        System.out.println("username=" + (hashMap.get("username")));
-        System.out.println("padding=" + (hashMap.get("padding")));
-        System.out.println("algorithm=" + (hashMap.get("algorithm")));
-        System.out.println("nonce=" + (hashMap.get("nonce")));
+        System.err.println("cipher=" + (hashMap.get("cipher")));
+        System.err.println("username=" + (hashMap.get("username")));
+        System.err.println("padding=" + (hashMap.get("padding")));
+        System.err.println("algorithm=" + (hashMap.get("algorithm")));
+        System.err.println("nonce=" + (hashMap.get("nonce")));
         return fromUserNonceSuperSecretKey(hashMap.get("username"), hashMap.get("nonce"), superSecretKey);
     }
 
     public static Aes fromUserNonceSuperSecretKey(String username, String nonce, String superSecretKey) throws NoSuchAlgorithmException {
         if (GenKey.generateDefaultUsername().equals(username)) {
-            System.out.println("AES use User Password");
+            System.err.println("AES use User Password");
         } else if ("none".equals(username)) {
             superSecretKey = GenKey.generateDefaultPsw();
         } else {
-            System.out.println("AES key-exchange unknown username");
+            System.err.println("AES key-exchange unknown username");
             return null;
         }
         byte[] md5 = md5Digest(nonce + ":" + superSecretKey);
diff --git a/src/main/java/main.kt b/src/main/java/main.kt
index 9bb2a0b..6cbc537 100644
--- a/src/main/java/main.kt
+++ b/src/main/java/main.kt
@@ -30,19 +30,19 @@ class Args(parser: ArgParser) {
 fun main(args: Array<String>) = mainBody {
     ArgParser(args).parseInto(::Args).run {
         if (keyExchange == null && nonce == null) {
-            println("Either the Key-Exchange or the nonce must be provided!")
+            System.err.println("Either the Key-Exchange or the nonce must be provided!")
             exitProcess(1)
         }
         if (cloudPassword == null) {
-            println("Cloud password not provided, using the default one for unprovisioned cameras")
+            System.err.println("Cloud password not provided, using the default one for unprovisioned cameras")
         }
         if (isatty(STDIN_FILENO) == 1) {
-            println("Data to ${if (encrypt) "encrypt" else "decrypt"} must be sent to standard input!")
+            System.err.println("Data to ${if (encrypt) "encrypt" else "decrypt"} must be sent to standard input!")
             exitProcess(1)
         }
         val toProcess = System.`in`.readAllBytesCompat()
         if (toProcess == null) {
-            println("Unable to read data from stdin!")
+            System.err.println("Unable to read data from stdin!")
             exitProcess(1)
         }