diff --git a/BuildingBlocks/src/Crypto/Implementations/LibsodiumSymmetricEncrypter.cs b/BuildingBlocks/src/Crypto/Implementations/LibsodiumSymmetricEncrypter.cs
index 82ac9abf81..3a6e666e60 100644
--- a/BuildingBlocks/src/Crypto/Implementations/LibsodiumSymmetricEncrypter.cs
+++ b/BuildingBlocks/src/Crypto/Implementations/LibsodiumSymmetricEncrypter.cs
@@ -10,7 +10,7 @@
 namespace Backbone.Crypto.Implementations;
 public class LibsodiumSymmetricEncrypter : ISymmetricEncrypter
 {
-    public static byte[] DecryptXChaCha20Poly1305(byte[] body, string serializedSecret)
+    public static byte[] DecryptXChaCha20Poly1305(byte[] body, byte[] key)
     {
         var bodyString = Encoding.UTF8.GetString(body);
         var deserializedBody = JsonSerializer.Deserialize<CryptoCipher>(bodyString,
@@ -22,11 +22,6 @@ public static byte[] DecryptXChaCha20Poly1305(byte[] body, string serializedSecr
         var payload = Convert.FromBase64String(cipherText);
         var nonce = Convert.FromBase64String(deserializedBody.nnc);
 
-        var deserializedSecret = JsonSerializer.Deserialize<Secret>(serializedSecret,
-            new JsonSerializerOptions { Converters = { new UrlSafeBase64ToByteArrayJsonConverter() } });
-
-        var key = Convert.FromBase64String(deserializedSecret!.key + "=");
-
         return DecryptXChaCha20Poly1305(payload, nonce, key);
     }
 
@@ -71,7 +66,7 @@ public ConvertibleString Decrypt(ConvertibleString encryptedMessage, Convertible
         ArgumentNullException.ThrowIfNull(key);
 
         var body = encryptedMessage.BytesRepresentation;
-        var serializedSecret = key.Utf8Representation;
+        var serializedSecret = key.BytesRepresentation;
 
         try
         {