Hashing the Longhorn

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Abstract

Microsoft (Longhorn) and the Trusted Computing Group are working on thebiggest change of the information landscape since decades.One of main problems with these plans is that the computer owner is seenasan adversary. To make DRM 'successful' users should no longer have thefull control over their own computers anymore.Because of this cryptographic flaws in the TCG/Longhorn design have to beconsidered exceptionally harmful.Even though cryptographers have warned since many years TCG/Longhornspecifications are using SHA-1 as standard hash function.Recent cryptographic results have shown additional a remarkablenumber of new serious security problems and practical attacks.Exemplarily we present new attacks on the digital signatures andthe boot check values which are used in Longhorn/TCG that canfundamentallycompromise 'trusted' systems.We warn Microsoft the TCG not to establish a security infrastructurebased on a broken hash algorithm.

Speakers

• Rüdiger Weis

Schedule

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