Display encrypted file using QuickLook framework or UiDocumentInteractionController

Question

I have an encrypted word/excel/pdf file locally stored which I need to preview in my iPad app. I understand that QLPreviewController or UiDocumentInteractionController could be

Answer 1

Actually, writing a file to a tmp directory is still insecure. The other alternative is to use UIWebView with NSURLProtocol and allow decrypting this data on the fly.