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<p>Created page with &quot;==Notes== &lt;pre&gt; Lecture 17 ---------- Questions? - OceanStore cache encrypted? - did anyone actually use pond/oceanstore? - why later systems used replication vs erasure...&quot;</p> <p><b>New page</b></p><div>==Notes==<br /> <br /> &lt;pre&gt;<br /> Lecture 17<br /> ----------<br /> <br /> Questions?<br /> - OceanStore cache encrypted?<br /> - did anyone actually use pond/oceanstore?<br /> - why later systems used replication vs erasure codes?<br /> - was encryption really everywhere, including replicated fragments?<br /> - search in contents of files?<br /> - issues with MACs?<br /> <br /> Do we have anything like OceanStore today?<br /> - untrusted cloud infrastructure for storage?<br /> NOPE<br /> - while you can encrypt remote data, you have to manually do multi-cloud deployments<br /> and deal with everyone&#039;s APIs<br /> - well, you could do S3-like things with multiple clouds, keep data encrypted<br /> - but you&#039;re working against how they want you to use the systems<br /> <br /> Note that OceanStore has no provisions for search or comparison<br /> - kind of goes against its design<br /> - modern work on search, computation on encrypted data, but not practical yet<br /> <br /> <br /> What distributed computing &amp; storage infrastructure do we have today that is &quot;untrusted&quot;?<br /> - cryptocurrencies, i.e., blockchain-based systems<br /> - these are VERY WASTEFUL, but why?<br /> <br /> For the rest of this class, we&#039;re going to be talking about trust<br /> - nothing works without some sort of trust<br /> - the trick is deciding what to trust, making that trustworthy,<br /> and to make the system fail gracefully when trust is violated<br /> <br /> What is trusted in OceanStore?<br /> - the software!<br /> - encoding, replicating, encrypting, etc<br /> - small bug can lead to data loss, privacy breach, really anything<br /> - and thus, the developers of the software<br /> - note the design is pretty monolithic, not much room for alternative mechanisms<br /> - who is responsible for fixing the bugs? UNCLEAR<br /> <br /> Contrast this with Amazon S3<br /> - bugs will happen, but are you trusting the software or the organization?<br /> &lt;/pre&gt;</div>

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