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NDSA-INFRASTRUCTURE  February 2012, Week 2

NDSA-INFRASTRUCTURE February 2012, Week 2

Subject:

Re: storage topic 1: encryption

From:

Cory Snavely <[log in to unmask]>

Reply-To:

The NDSA infrastructure working group list <[log in to unmask]>

Date:

Mon, 13 Feb 2012 18:39:25 -0500

Content-Type:

text/plain

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Parts/Attachments

text/plain (76 lines)

My answers below.

On 02/13/2012 12:17 PM, Goethals, Andrea wrote:
> I hope you all don't mind my starting this series off. I think this would work best if we pass the virtual baton around to a different person after each topic. We can queue up a list of topics on the wiki so people know what's coming next.
>
> The first topic is encryption in preservation storage. I am thinking about hardware or software or file encryption primarily imposed by the repository (but whether or not you accept content encrypted by others is also interesting). I am thinking less about encrypting for transport (e.g. https). Say what you want about it but I'll pose some questions to get you thinking about it.
>
>
>
> * Do you have any opinions on it? What are your reasons for your opinions (gut feelings are OK)?

Pros:

* Strong encryption eliminates worries associated with unauthorized
access to preservation copies of materials (such as copyrighted data).
* Encryption doubles as an authenticity check, and in fact, some
encryption methods involve the creation of a digital signature that can
be used for provenance or bit rot detection.

Cons:

* Encryption causes file size bloat to the tune of 20-30%.
* For light archives, encryption imparts a performance penalty for
systems that need to extract the content from the preservation archive
for access purposes.
* Long-term secure preservation of the decryption keys themselves is
typically raised as a concern, although personally I feel that solutions
to this problem are straightforward, albeit complex.

> * What kinds of problems do you think it might create in the future?

As mentioned, preservation of the encryption keys is typically raised as
a long-term concern.

Format obsolescence and the need for migration is of equal concern with
encryption formats as it is with data storage formats themselves.

> * Do you have any current requirements to do this (laws, policies)? What are the conditions under which you need to encrypt? Do you know of any upcoming requirements for you to do this?

No.

> * If you do it what technique(s)/strategies do you use? Do you isolate encrypted content from non-encrypted content?

We use Tivoli Storage Manager (TSM) client-side encryption for our tape
backups. We do not operate the tape backup system we use, so we want to
isolate our data security from the tape backup system environment.

> * Do you know of any relevant studies/papers, etc. about this topic?

No.

> Someone proposed that we keep each topic discussion to around 2 weeks so let's see if we've said what we want to by March 2. We can always extend this one since there was no advance notice of the topic.
>
> Thanks,
> Andrea
>
> Andrea Goethals
> Digital Preservation and Repository Services Manager
> Harvard Library Office for Information Systems
> [log in to unmask]
> (617) 495-3724
>
>
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