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Jeroen W. Pluimers on .NET, C#, Delphi, databases, and personal interests

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The cloud has no walls: cache-based jamming agreement to communicate over the CPU cache even without rights

Posted by jpluimers on 2017/10/12

Oh boy: [WayBack] Alles kaputt: In der Cloud gibt es keine Wände.  – Kristian Köhntopp – Google+:

Two Amazon EC2 instances communicating over the CPU cache without the need of a network in-between them.

Open sourced foundations: IAIK/CJAG: CJAG is an open-source implementation of our cache-based jamming agreement.

In our BlackHat Asia 2017 Talk we show that the cache covert channel we built is so fast and reliable that we can do much more than tunneling SSH over it: We show that we can even stream a music video in decent quality through the cache – on the Amazon EC2 cloud.

See the BlackHat Asia Briefings Information here:…

See a video of the Live Demo here:…

Find our NDSS 2017 paper here:


Demonstration video:

Song video:


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