I have a requirement where I need to encrypt my page field data using the Document.BeforeSave from the back office. this is fine and it works, but I cant find any events to place my decrypt code so the backoffice can load the data back for the user to edit.

I've tried ContentControl.AfterContentControlLoad where I can access the field, decrypts but the editor doesnt show the decrypted content. Can anyone advise how to solve or is there a better way to encrypt/decrypt data that is readable in the back office ?

public void Content_AfterLoad(ContentControl sender, umbraco.controls.ContentControlLoadEventArgs e) {
        if (sender.ContentObject.getProperty("childName")!=null){
            Document doc = new Document(sender.ContentObject.Id);
            // following two lines correctly decrypt field but the backoffice editor doesnt show updated content
            doc.getProperty("childName").Value = Decryption(doc.getProperty("childName").Value.ToString());
            sender.ContentObject.getProperty("childName").Value = Decryption(doc.getProperty("childName").Value.ToString());
        }
       
    }

Thanks.