Re: Feature suggestion. Indexing encrypted mail?

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+Message-ID: <53438849.5050500@fifthhorseman.net>\r
+Date: Tue, 08 Apr 2014 01:25:29 -0400\r
+From: Daniel Kahn Gillmor <dkg@fifthhorseman.net>\r
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+To: Mark Walters <markwalters1009@gmail.com>, \r
+       Jeremy Nickurak <not-much@trk.nickurak.ca>,\r
+       Jameson Graef Rollins <jrollins@finestructure.net>\r
+Subject: Re: Feature suggestion. Indexing encrypted mail?\r
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+       Daniel Kahn Gillmor <dkg@debian.org>\r
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+On 04/07/2014 05:06 PM, Mark Walters wrote:\r
+\r
+> I think it is worse that that: I think (from what people said on irc\r
+> some time ago) that the index contains the word and the position of tha=\r
+t\r
+> word so essentially the whole message can be reconstructed from the\r
+> index.\r
+\r
+Agree with Mark here, the warnings around such a feature should clearly\r
+say "this stores a cleartext equivalent of your message in the notmuch\r
+index."\r
+\r
+Even if the index weren't structured in this way, modern natural\r
+language processing techniques and a plausible training corpus should be\r
+able to come very close to the original cleartext message, so it should\r
+be treated as such.\r
+\r
+fwiw, the workflow i outlined should make it so that users can receive\r
+all messages encrypted; when they read each encrypted message, they get\r
+a choice about whether to store a cleartext-equivalent in their notmuch\r
+index. (note of course that it's possible to store your notmuch index on\r
+an encrypted filesystem itself, for a different flavor of\r
+confidentiality protection for the data once it's come to rest).\r
+\r
+This per-message decision mechanism lets a thoughtful user make that\r
+tradeoff on a piecemeal basis (it also allows for blanket\r
+(mis)judgement, of course).  There are certainly some messages that one\r
+might never want store in a cleartext index, while other messages might\r
+be less sensitive to exposure while being more valuable to the user if\r
+stored in a well-indexed, searchable local archive.\r
+\r
+I think this is a feature worth having, despite the warning labels it\r
+probably needs.\r
+\r
+       --dkg\r
+\r
+\r
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