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ARM trustZone

Vipin Josua
Note: This was originally posted on 21st June 2012 at http://forums.arm.com

[color=#222222][font=arial, sans-serif][size=2]I am a student from kuwait and very much interested in trusted computing. I have few doubts in basic understanding of trusted computing.[/size][/font][/color][color=#222222][font=arial, sans-serif][size=2]
[/size][/font][/color][color=#222222][font=arial, sans-serif][size=2]1) What was the need for Trustzone when TPM itself could perform trusted computing ? Is it just because of space contraints due to extra chip?[/size][/font][/color][color=#222222][font=arial, sans-serif][size=2]2) Why cannot the secure OS in trustzone be modified? is it because it is smaller trust base one can make it bug free?[/size][/font][/color][color=#222222][font=arial, sans-serif][size=2]3) What is the basic difference between Intel TXT and Trustzone ?   [/size][/font][/color][color=#222222][font=arial, sans-serif][size=2]
[/size][/font][/color][color=#222222][font=arial, sans-serif][size=2]  I tried searching in internet about Intel TXT and I am totally confused. Thanks a lot in advance for your help. [/size][/font][/color]
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  • Note: This was originally posted on 8th July 2012 at http://forums.arm.com

    Thanks a lot.But the more documents I read , I am more unclear on fundamental concept . If anyone can please explain what is 'virtualisation' and what does ARM mean by saying they provide a  hardware enforced virtualisation ?

    So far, What I understood is only one processor which has two OSes ( just like Linux + Windows) , but one OS has previlage to secure regions and written bug-free so we name it TrustZone. Ofcourse to enable this privilage we modify the hardware of SoC and also give a mechanism that this secure OS cannot be re-written.
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  • Note: This was originally posted on 8th July 2012 at http://forums.arm.com

    Thanks a lot.But the more documents I read , I am more unclear on fundamental concept . If anyone can please explain what is 'virtualisation' and what does ARM mean by saying they provide a  hardware enforced virtualisation ?

    So far, What I understood is only one processor which has two OSes ( just like Linux + Windows) , but one OS has previlage to secure regions and written bug-free so we name it TrustZone. Ofcourse to enable this privilage we modify the hardware of SoC and also give a mechanism that this secure OS cannot be re-written.
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