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

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,


T-Mobile International
Terminal Technology
Rainer Hillebrand
Head of Terminal Security
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Received on Monday, 2 March 2009 13:57:10 UTC