Doom9's Forum - View Single Post - Understanding AACS (including Subset-Difference)

HyperHacker · 25th February 2007, 03:04

Thanks, that explanation was a huge help.

Is revocation not a weakness then? Right now the media key is encrypted only once on the disc, with the device key for node 1, but if they wanted to revoke a device they'd have to include a few different copies of the media key encrypted with different device keys; is this right? So then we have a few blocks that we know will all decrypt to the same plaintext. I'm no cryptographist but this seems like a potential weakness...

25th February 2007, 03:04	#90 \| Link
HyperHacker Resident DRM Hater Join Date: Oct 2006 Location: International waters Posts: 242	Thanks, that explanation was a huge help. Is revocation not a weakness then? Right now the media key is encrypted only once on the disc, with the device key for node 1, but if they wanted to revoke a device they'd have to include a few different copies of the media key encrypted with different device keys; is this right? So then we have a few blocks that we know will all decrypt to the same plaintext. I'm no cryptographist but this seems like a potential weakness... __________________ Because Moogles pwn.