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Re: Re: "SIGINT tradecraft…is very hands-on (l i terally!)"
From: stef <[email protected]>
On Wed, May 14, 2014 at 09:03:50AM -0700, jim bell wrote:
> I guess I'm still not being clear. Â It would be my way of objecting to a court's ordering the telecom company that
>I might work for (or, one day, that I might own?!?) to present an "electronically-readable" form of the telephone >metadata of millions of telephones. Â The judge ordered that; my sneaky response would be to generate an >"electronically-readable" file, basically a pdf file or a series of same, itself with an image that looks like >"captcha" information: Â relatively easy for a human to read, but rather difficult for any computer to turn into >easily-useable (searchable) information. Â In other words, the information would be presented to the NSA, but it >would be essentially unuseable without being (first) human-decoded.
>assuming this is correct:
>http://googleonlinesecurity.blogspot.de/2014/04/street-view-and-recaptcha-technology.html
>then googlestreetview tech is better at solving captchas than humans.
For a single, tiny piece of "captcha", that might very well be true. Â But suppose the telephone metadata information for a billion phone calls per day is turned into "captcha's". Â How much CPU power would the NSA have to apply, each day, just to back-convert that metadata into computer-searchable form? Â Admittedly, that's irrelevant: Â The NSA would simply ask the court to order the company to stop being a wiseass, and to stop using the captcha technique. Â
    Jim Bell
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