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<p class="MsoNormal"><span style="font-family:"Calibri","sans-serif";color:#1F497D">Bhandra, Malini K wrote:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoPlainText" style="margin-left:.5in;text-indent:-.25in;mso-list:l0 level1 lfo1">
<![if !supportLists]><span style="font-family:Wingdings;color:#1F497D"><span style="mso-list:Ignore">Ø<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="color:#0070C0">Malini: True. I do not comprehend your lock-box analogy completely.<o:p></o:p></span></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText"><span style="color:#1F497D">A lockbox is a) where you store the keys which are needed to decrypt the encrypted entities,<o:p></o:p></span></p>
<p class="MsoPlainText"><span style="color:#1F497D">b) what needs to be unlocked (preferably once) when it is established that the components<br>
are operating as intended in the intended environment, and c) preferably stored somewhere<br>
other than on the same devices that the enclosed keys reference.<o:p></o:p></span></p>
<p class="MsoPlainText"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoPlainText"><span style="color:#1F497D">As I understand your proposal, the lockbox is a central database.<o:p></o:p></span></p>
<p class="MsoPlainText"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoPlainText"><span style="color:#1F497D">I think that this approach actually undermines security.<o:p></o:p></span></p>
<p class="MsoPlainText"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoPlainText"><span style="color:#1F497D">What you should do instead is have a lockbox on each encrypting storage server (Cinder, Swift<br>
and who knows what other storage services).<o:p></o:p></span></p>
<p class="MsoPlainText"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoPlainText"><span style="color:#1F497D">The role of the key-manager is to a) approve unlocking each lockbox so that the contents<br>
can be used, and b) approve and enable transfers of individual keys between lockboxes.<o:p></o:p></span></p>
<p class="MsoPlainText"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoPlainText"><span style="color:#1F497D">With what I am proposing a key is *<b>never</b>* saved on disk or put on the wire in plain-text format.<o:p></o:p></span></p>
<p class="MsoPlainText"><span style="color:#1F497D">Each system generates as-close-to-truly-random-as-possible keys *<b>inside</b>* their own lockbox.<o:p></o:p></span></p>
<p class="MsoPlainText"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoPlainText"><span style="color:#1F497D">One critical issue with a lockbox approach is where it is stored. If you stick with partitions and volumes<o:p></o:p></span></p>
<p class="MsoPlainText"><span style="color:#1F497D">The lockbox will fit on TPMs or on-motherboard non-volatile storage. If you have a key for every object<o:p></o:p></span></p>
<p class="MsoPlainText"><span style="color:#1F497D">Then the lockbox will no longer be small enough to do that. The number of storage devices in a scale-out<br>
storage server is not typically that great, having to use an external device to safely hold keys will reduce<o:p></o:p></span></p>
<p class="MsoPlainText"><span style="color:#1F497D">the capacity of the storage server as a whole. Using a TPM or some other on-motherboard small device<br>
is far more effective.<o:p></o:p></span></p>
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