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[PATCH v2 7/7] i440fx: add an iommu

[PATCH v2 7/7] i440fx: add an iommu

Posted Nov 2, 2012 0:15 UTC (Fri) by vonbrand (guest, #4458)
Parent article: [PATCH v2 7/7] i440fx: add an iommu

Several rounds of XOR are equivalent to one round of XOR... get two messages XORed to the same key, you have the XOR of the messages. Know some bits of the message, you get the bits of the key.


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[PATCH v2 7/7] i440fx: add an iommu

Posted Nov 2, 2012 4:23 UTC (Fri) by mjg59 (subscriber, #23239) [Link]

You may have discovered the joke.

[PATCH v2 7/7] i440fx: add an iommu

Posted Nov 2, 2012 20:05 UTC (Fri) by jonabbey (guest, #2736) [Link]

By george, I think he's got it! ;-p

[PATCH v2 7/7] i440fx: add an iommu

Posted Nov 5, 2012 15:26 UTC (Mon) by ortalo (subscriber, #4654) [Link]

Don't laugh so loudly, that's an attempt at a variant of Shannon's perfect cipher after all. Hey, not everyone can afford an infinite key length!
Okay, while we are on savings, we could equivalently save the XOR step and not do any enc^D^D^D scrambling at all for an even cheaper, faster and nearly as (un)secure variant...


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