diff --git a/Obfuz/Packages/com.code-philosophy.obfuz/Editor/Data/ConstFieldAllocator.cs b/Obfuz/Packages/com.code-philosophy.obfuz/Editor/Data/ConstFieldAllocator.cs
index 7d90f8f..caf1725 100644
--- a/Obfuz/Packages/com.code-philosophy.obfuz/Editor/Data/ConstFieldAllocator.cs
+++ b/Obfuz/Packages/com.code-philosophy.obfuz/Editor/Data/ConstFieldAllocator.cs
@@ -109,7 +109,7 @@ namespace Obfuz.Data
                 _module.EnableTypeDefFindCache = true;
             }
 
-            var field = new FieldDefUser($"{ConstValues.ObfuzInternalSymbolNamePrefix}RVA_Value{_holderTypeDef.Fields.Count}", new FieldSig(GetTypeSigOfValue(value)), FieldAttributes.Static | FieldAttributes.Private | FieldAttributes.InitOnly);
+            var field = new FieldDefUser($"{ConstValues.ObfuzInternalSymbolNamePrefix}RVA_Value{_holderTypeDef.Fields.Count}", new FieldSig(GetTypeSigOfValue(value)), FieldAttributes.Static | FieldAttributes.Public | FieldAttributes.InitOnly);
             field.DeclaringType = _holderTypeDef;
             return new ConstFieldInfo
             {
diff --git a/Obfuz/Packages/com.code-philosophy.obfuz/Editor/Data/RvaDataAllocator.cs b/Obfuz/Packages/com.code-philosophy.obfuz/Editor/Data/RvaDataAllocator.cs
index ed8e748..3d4d8dd 100644
--- a/Obfuz/Packages/com.code-philosophy.obfuz/Editor/Data/RvaDataAllocator.cs
+++ b/Obfuz/Packages/com.code-philosophy.obfuz/Editor/Data/RvaDataAllocator.cs
@@ -106,7 +106,7 @@ namespace Obfuz.Data
             var holderField = new FieldDefUser($"$RVA_Data{_rvaFields.Count}", new FieldSig(dataHolderType.ToTypeSig()), FieldAttributes.InitOnly | FieldAttributes.Static | FieldAttributes.HasFieldRVA);
             holderField.DeclaringType = _rvaTypeDef;
 
-            var runtimeValueField = new FieldDefUser($"$RVA_Value{_rvaFields.Count}", new FieldSig(new SZArraySig(_module.CorLibTypes.Byte)), FieldAttributes.Static);
+            var runtimeValueField = new FieldDefUser($"$RVA_Value{_rvaFields.Count}", new FieldSig(new SZArraySig(_module.CorLibTypes.Byte)), FieldAttributes.Static | FieldAttributes.Public);
             runtimeValueField.DeclaringType = _rvaTypeDef;
             return (holderField, runtimeValueField);
         }
@@ -117,6 +117,7 @@ namespace Obfuz.Data
             if (_dataHolderTypeBySizes.TryGetValue(size, out var type))
                 return type;
             var dataHolderType = new TypeDefUser($"$ObfuzRVA$DataHolder{size}", _module.Import(typeof(ValueType)));
+            dataHolderType.Attributes = TypeAttributes.Public | TypeAttributes.Sealed;
             dataHolderType.Layout = TypeAttributes.ExplicitLayout;
             dataHolderType.PackingSize = 1;
             dataHolderType.ClassSize = (uint)size;
diff --git a/Obfuz/Packages/com.code-philosophy.obfuz/Editor/ObfusPasses/CallObfus/CallProxyAllocator.cs b/Obfuz/Packages/com.code-philosophy.obfuz/Editor/ObfusPasses/CallObfus/CallProxyAllocator.cs
index da44d86..1164db6 100644
--- a/Obfuz/Packages/com.code-philosophy.obfuz/Editor/ObfusPasses/CallObfus/CallProxyAllocator.cs
+++ b/Obfuz/Packages/com.code-philosophy.obfuz/Editor/ObfusPasses/CallObfus/CallProxyAllocator.cs
@@ -126,7 +126,7 @@ namespace Obfuz.ObfusPasses.CallObfus
             }
             MethodDef methodDef = new MethodDefUser($"{ConstValues.ObfuzInternalSymbolNamePrefix}ProxyCall$Dispatch${_proxyTypeDef.Methods.Count}", methodSig,
                 MethodImplAttributes.IL | MethodImplAttributes.Managed,
-                MethodAttributes.Static | MethodAttributes.Private);
+                MethodAttributes.Static | MethodAttributes.Public);
             methodDef.DeclaringType = _proxyTypeDef;
             return methodDef;
         }
diff --git a/Obfuz/Packages/com.code-philosophy.obfuz/Runtime/EncryptionService.cs b/Obfuz/Packages/com.code-philosophy.obfuz/Runtime/EncryptionService.cs
index bd6cd98..ccd0cea 100644
--- a/Obfuz/Packages/com.code-philosophy.obfuz/Runtime/EncryptionService.cs
+++ b/Obfuz/Packages/com.code-philosophy.obfuz/Runtime/EncryptionService.cs
@@ -9,7 +9,8 @@ namespace Obfuz
 
     public static class EncryptionService<T> where T : IEncryptionScope
     {
-        private static IEncryptor _encryptor;
+        // for compatibility with Mono because Mono will raise FieldAccessException when try access private field
+        public static IEncryptor _encryptor;
 
         public static IEncryptor Encryptor
         {