Fixed missing reference on profile page

Teknik/Areas/User/Views/User/ViewProfile.cshtml

@@ -1,6 +1,7 @@
 @model Teknik.Areas.Users.ViewModels.ProfileViewModel
 
 @using Teknik.Utilities
+@using Teknik.Utilities.Cryptography
 
 <script>
     var generateDeleteKeyURL = '@Url.SubRouteUrl("u", "Upload.GenerateDeleteKey")';