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Descripción TCPA and Palladium
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6.857 Computer and Network Security
October 17, 2002
Lecture Notes 12 : TCPA and Palladium
Lecturer: Pato/LaMacchia Scribe: Barrows/DeNeui/Nigam/Chen/Robson/Saunders/Walsh
Joe Pato of Hewlett-Packard presented the Trusted Computing Platform Alliance (TCPA). Brian
LaMacchia of Microsoft presented Palladium. Barrows, DeNeui, and Nigam scribed the notes on
TCPA. Chen, Robson, Saunders, and Walsh scribed the notes on Palladium. Slides from both
speakers are available on the 6.857 Web site.
TCPA
Outline
Why Trusted Computing Platforms
The Trusted Computing Platform Alliance
TCPA Concepts
TCPA Feature Set
Benefits of TCPA
1 Why Trusted Computing Platforms
The overall goals of a trusted computing platform are to increase business and customer confidence
with the security of a platform, to reduce business risks associated with insecurely storing data, and
additionally to protect end-user private data.
A trusted computing platform should address questions such as: Can I trust a target machine to
behave in an expected manner (maybe based on past performance)? Can I have confidence in
interacting with the platform? Can I trust you (the user) to be what you say you are?
A Trusted Computing Platform should:
Recognize that a platform has known properties
Identify that a system will behave as expected
Enable a user to have more confidence in the behavior of the platform in front of them
0May be freely reproduced for educational or personal use.
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L12-TCPA-PALLADIUM pdf
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challenge response protocols for authorization mechanisms. Unfortunately, since the CA knows all
the keys that have been generated, the CA can correlate identities to platforms.
Conformance
The parties involved have various responsibilities. The TCPA’s role is that the TPM protection
profile is to be completed and will include CRTM and connection to platform. The manufacturers’
role is to create a security target, and produce a product design evaluation.
5 Benefits of TCPA
In the short and middle term, TCPA allows for more securely encrypted data and provides for the
measurement of integrity metrics of the software environment on the TCPA platform. In the long
term, we can learn what software is running on a machine and have confidence in the information
about the software environment and identity of a remote party, enabling higher levels of trust when
interacting with this party.

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L12-TCPA-PALLADIUM arduino
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Nexus Policy
Everything that runs today will run on Palladium systems
The platform will run any nexus
The user will be in charge of what nexuses he chooses to run
The MS nexus will run any application
The user will be in charge of the applications that he chooses to run
The MS nexus will interoperate with any network service provider
The MS nexus source code will be made available for review
“The security mode will be off by default. You can’t have it on by default. This is a hard lesson
for Microsoft. Users always click ‘yes, sure, go ahead format my hard drive — I don’t have time to
read this! I have work to do.’ ” Somehow you have to tell Microsoft what to run on Palladium.
The talk was interrupted by Q&A. See the Palladium slides (24-29) posted on the course handout
page for information about:
Privacy of Machine Identity
Pseudo-Identities
Registering a Pseudo-Identity
Summary
9 Questions & Answers
Q: Have you thought about user interface for designating right hand side application windows vs
left hand side applications?
A: You could store a secret (user’s favorite fruit plus number) in Palladium, and display that secret
every time Palladium window comes up. Alternately, you could use a hardware indicator.
Q: Can I run pirated Microsoft Word on this? - Randall Davis
A: Well yes, now, but it is possible to use Palladium to interfere in the future maybe, i.e. if part
of Word runs in the right hand (it never makes sense to run it all in the right hand because
it’s too big and takes too much work to migrate over). So it is possible to write applications
that do that. We [Palladium group] are not involved with the app guys, though. MS is a tribe
of 200 groups that dislike each other. Word sits on the left hand side now. Anything I send
out to word in the left hand is insecure. - Brian LaMacchia
Q: Would it be possible to design the crypto so that the user can always force a decryption – is
it technically possible (if not smart)? - Hal Abelson

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