diff --git a/MockMobile/Program.cs b/MockMobile/Program.cs
index db46de3..1e7a403 100644
--- a/MockMobile/Program.cs
+++ b/MockMobile/Program.cs
@@ -160,7 +160,7 @@ string? EncryptData(string encryptionKey, Mode mode)
 
 	string rawData = JsonConvert.SerializeObject(mockData);
 	byte[] dataBytes = Encoding.UTF8.GetBytes(rawData);
-	byte[] keyBytes = Encoding.UTF8.GetBytes(encryptionKey);
+	byte[] keyBytes = Convert.FromBase64String(encryptionKey);
 
 	using Aes aes = Aes.Create();