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Securing Platform and Trusted Computing Model

Securing Platform and Trusted Computing Model

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Abbie Barbir Tcg Final Abbie Barbir Tcg Final Presentation Transcript

  • Securing Platform and Trusted Computing Model Abbie Barbir, Ph.D Web Services and Security Advisor Nortel
  • Objectives of this Presentation
    • Provide an overview of “TC” and my impressions of some of its pros/cons
    • Initiate a discussion (within ITU-T) as to what role/value this type of approach has in secure solutions
      • Identify challenges / areas for further study ?
    dates
  • Technology History
    • IBM pioneered technology (early 1990’s)
    • Founded Trusted Computing Platform Alliance in 1999
    • TPM 1.1b spec released early 2002
    • Trusted Computing Group Formed in April 2003
    • TPM 1.2 specification released February 2005
    • In 2004, IBM, Intel, and NTT DoCoMo submitted a set of Trusted Mobile Platform specifications defining security features for mobile devices has been released for public
      • Provides comprehensive end-to-end security architecture for mobile wireless platforms
    dates View slide
  • TCG Trusted Computing Basic Concepts
    • A trustable platform is one that behaves in the expected manner for the intended purpose (e.g. from point of view of IT manager)
    • Achieved through the following technology
      • Platform Authentication and Attestation
        • Identify the platform and its properties to a challenging party
      • Platform Integrity Reporting
        • Ability to query and report on a platform software state in a reliable manner
      • Protected Storage
        • Protect secret data against subversion
    dates View slide
  • TCG Roots of Trust
    • Trusted Platform Module (TPM):
    • Root of Trust for Reporting
    • Tamper resistant
      • RSA (default keys 2048 bit)
    • Stores Platform Measurements
      • Platform Configuration Registers (PCR)
    • Signature key reports on PCR contents
    • Random Number Generator
    • SHA-1 Hash Computation Engine
    • Nonvolatile memory
    dates
    • Serve as an anchor for a certificate verification chain
      • Third parties can rely on this trust
    • Core Root of Trust for Measurement
    • (CRTM)
    • Code that executes at boot time
      • Example: Bios
    • Trusted to properly report to the TPM on the software that executes later
    • Only authorized entities can rewrite the CRTM
    Hash CPU NV-memory RNG key generation Memory Digital signature & RSA Crypto I/O MAC PCR
  • Attestation Feature
    • Attestation creates a shared secret between the application and remote party
      • Prevents session hijacking
    • Attestations are digitally signed
      • Using various TPM/Platform bound CAs
    • Each layer of the platform is checked
      • Hardware attests what operating system is booted
      • OS attests on which applications it requires a key for
      • Report on the value of the PCR
      • Uses a challenge-response protocol
    dates Server TPM Nonce Sign (nonce, PCR,..,log), Certificate ID
  • Trusted Network Connect (TNC)
    • Network Access Control
      • Integrity
        • Access device is healthy
      • Identity
        • Tied to TPM identity
    • Endpoints Security Policy
      • Protective S/W configured properly
      • Allows authorized users (Strong Identity)
      • Network Access policy compliance
    • TPM functionality to thwart attacks
      • Hardened client
    dates
    • Access Authorization dialog
      • 802.1X/ EAP Access
    • TNC dialog protected
    Access Requester (Client) Dialog TNC Transport TNC Client TCG Integrity Measurement Access Server TCG Integrity Measurement PEP/PDP TNC Server
  • Security Design Principles dates
    • Least Privilege: Each principle is given the minimum access
    • needed to accomplish its task
      • Keep the Trusted Computing Base small
        • OS parts that ensures proper system functioning
          • e.g., the OS Kernel & Hardware
    • Current trends
    • Today’s systems are large
      • Win2k OS is over 50 MB
    • Software is continuously updated on users devices
    • A hacker is your next door neighbor
    • May need to depend on infrastructure for trust
      • TPM part of a small Kernel
        • Today may be ideal for Mobile Devices
  • Secure Computing Challenges 1/2
    • Security for whom ?
    • Can TCG solve SPAM, Malicious code etc.
    • TPM is a cryptographic co-processor , with some trust anchors (issuer certificates) and private keys “wired in” at the factory
      • Various cryptographic smart-card technologies, in both PCMCIA and ISO-7816 packaging have been around for nearly a decade
        • Such technology has not measurably improved security
    • How much TCG will improve security in the real world?
    dates
  • Secure Computing Challenges 2/2
    • In TCG TPM acts as a notary
    • In real world, a notary issues a special type of signature and seal on a paper document merely attests to the existence and superficial contents of the document
      • Notary seal cannot make any attestations to the underlying truth of the document
      • How can we enable the TPM to verify the underlying truth of statements that are handed to
    • To improve the value of the attestation feature
      • Do we need to have a small secure operating system, and application software that is moved into the TPM, and fixed at the factory
    dates
  • Possible Study Items
    • Security is about risk management
      • Can we have a systematic approach for identifying un-trustworthy devices in a TCG environment
    • How does TCG relate to Firmware in devices
      • Would TCG force hackers to target Firmware instead of software
    • It is all about NEAT : Non-Bypassable, Evaluate-able, Always Invoked, and Tamper-Proof 1
    dates
  • Conclusions
    • Trusted Computing offers some good features
      • Secure Data
      • Secure Boot
      • Endpoint Security
      • Binding of trusted physical identity allows trusted network identity
      • Great forces behind it
    • An interesting topic to follow
    dates
  • Acknowledgment dates
    • Many thanks to my colleague Marcus Leech for his valuable input and insight that helped make this presentation possible.
  • Q and A dates
  • References dates
    • Anderson, J. P., Computer Security Technology Planning Study , ESD-TR-73-51, ESD/AFSC, Hanscom AFB, Bedford, MA, October 1972
    • Trusted Computing Website http://www.trustedcomputinggroup.org
    • Trusted Mobile http://www.trusted-mobile.org/
    • Security Solutions http://www.nortel.com/solutions/securenet/index.html