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RE: Reminder: January 31 comment deadline for LCWD of Widgets 1.0: Packaging & Configuration spec

From: Hillebrand, Rainer <Rainer.Hillebrand@t-mobile.net>
Date: Mon, 2 Mar 2009 14:56:22 +0100
Message-ID: <41C7C0F2BC2713438D933052463E9259024A8879@DEMSWBMXSC0104.sv.ad.tmo>
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

*************************************
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Rainer Hillebrand
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Received on Monday, 2 March 2009 13:57:10 GMT

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