- From: Hillebrand, Rainer <Rainer.Hillebrand@t-mobile.net>
- Date: Mon, 2 Mar 2009 14:56:22 +0100
- To: <marcosc@opera.com>
- Cc: "public-webapps" <public-webapps@w3.org>
Dear Marcos, In order to detect a man-in-the-middle-attack, a widget resource is signed, either by an author's certificate that I trust or by an author certificate and a distributor certificate that I trust. "that I trust" means that I have the proven public keys for these certificates. If an attacker replaces or adds a file in the widget resource after it was signed then the signatures will be invalid. If the signatures are stripped off, a file is replaced or added and the widget resource is signed again with another certificate that I do not trust then the attack will fail when checking the signature. I would agree with you that a secure transport will be useful if the widget resource is unsigned or signed with an unknown certificate. Then it will be the decision of a security framework and its security policies how such a widget resource will be treated. Best Regards, Rainer ************************************* T-Mobile International Terminal Technology Rainer Hillebrand Head of Terminal Security Landgrabenweg 151, D-53227 Bonn Germany +49 171 5211056 (My T-Mobile) +49 228 936 13916 (Tel.) +49 228 936 18406 (Fax) E-Mail: rainer.hillebrand@t-mobile.net http://www.t-mobile.net This e-mail and any attachment are confidential and may be privileged. If you are not the intended recipient, notify the sender immediately, destroy all copies from your system and do not disclose or use the information for any purpose. Diese E-Mail inklusive aller Anhänge ist vertraulich und könnte bevorrechtigtem Schutz unterliegen. Wenn Sie nicht der beabsichtigte Adressat sind, informieren Sie bitte den Absender unverzüglich, löschen Sie alle Kopien von Ihrem System und veröffentlichen Sie oder nutzen Sie die Information keinesfalls, gleich zu welchem Zweck. T-Mobile International AG Aufsichtsrat/ Supervisory Board: René Obermann (Vorsitzender/ Chairman) Vorstand/ Board of Management: Hamid Akhavan (Vorsitzender/ Chairman), Michael Günther, Lothar A. Harings, Katharina Hollender Handelsregister/Commercial Register Entry: Amtsgericht Bonn, HRB 12276 Steuer-Nr./Tax No.: 205 / 5777/ 0518 USt.-ID./VAT Reg.No.: DE189669124 Sitz der Gesellschaft/ Corporate Headquarters: Bonn
Received on Monday, 2 March 2009 13:57:10 UTC