NOBUS (‘nobody but us’) are security vulnerabilities which the U.S. National Security Agency (NSA) believes that only it can exploit.
As such, the agency sometimes chooses to leave such vulnerabilities open, in order to exploit them against NSA’s targets. More broadly, it refers to the notion that some signals intelligence capabilities are so powerful or otherwise inaccessible that only the NSA will be able to deploy them, though recent analyses suggest that this advantage may be under stress.
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The Daily Omnivore 