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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@Snowden Could it be as broad as a keyword or phrase? Or more like IP address? -
Would it be whatever the FISC judge approved? We don’t know legally how accurate a selector has to be.
@snowden -
1/2 If the selector is considered the “facility” then there has to be prob cause it is used by the foreign power.
@snowden -
The NYT story says there was PC it was “uniquely” used. But that requirement is not in FISA’s §1805.
@snowden -
probably had to get that here to ensure you weren't also grabbing emails not from the target AFP
@LizaGoitein@Snowden -
Isn't this missing the point? Even if signature unique, they still scanned everyone's email.
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Not beside the point if the nature of digital sig. affects whether scan involves content.
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Would likely be content in the email body and not metadata, akin to this joke.
@JameelJaffer@JakeLaperruque@granick@Snowdenpic.twitter.com/TrRTaG5jvp
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I suspect it's any arbitrary text string, as would be supported by the pre-existing system Yahoo filtering system.
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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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The usual suspects (emails, IPs, usernames, etc), but also cryptographic hashes that identify known files (MD5/SHA1)...
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Do you read anything into Charlie describing it as a digital signature "of a communication method"? (Not of a user/account/server)
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