OK techie friends, help me out... what's a "digital signature"?http://www.nytimes.com/2016/10/06/technology/yahoo-email-tech-companies-government-investigations.html?_r=0 …
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Replying to @LizaGoitein
Combining the NYT and Reuters reports with my own experience, I doubt they mean a "digital signature" in the formal sense. 1/
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Replying to @Snowden @LizaGoitein
I suspect it's any arbitrary text string, as would be supported by the pre-existing system Yahoo filtering system.
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Replying to @Snowden @LizaGoitein
In practical terms, this means anything you can convince FISC to stamp. At NSA, I saw live examples of the following:
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Replying to @Snowden @LizaGoitein
The usual suspects (emails, IPs, usernames, etc), but also cryptographic hashes that identify known files (MD5/SHA1)...
5 replies 19 retweets 54 likes -
Replying to @Snowden @LizaGoitein
Sub-strings from base-64 encoded email attachments (derived from things like embedded corporate logos), and any uncommon...
3 replies 15 retweets 44 likes -
Replying to @Snowden @LizaGoitein
...artifacts arising from a target's tooling, for example if their app transmits a UUID (like a registration code or serial).
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Replying to @Snowden @LizaGoitein
The possibilities here are basically limitless, and we can't infer the specific nature of the string without more info.
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Replying to @Snowden
Big legal issue is whether scan included content or not. Do we need more info on the string to answer that Q?
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Replying to @LizaGoitein
If Yahoo repurposed pre-existing CP/spam scanning systems as claimed in the articles, scan would likely included content.
10 replies 26 retweets 49 likes
That is, after all, the purpose of those scanners: to filter the content-field (body/attachments) of bulk emails.
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Replying to @Snowden
So helpful. Thank you. I know content-metadata distinction is bogus, but still makes a big difference legally.
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