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by midas007 4428 days ago
Yes, it's a known weakness. You have to rekey every X blocks.
1 comments
tptacek 4428 days ago
No, rekeying does not solve that problem, not to mention which you've just handwaved a hard problem (varying the key over different sectors). That's doable (though it again doesn't fix the problem with your proposal), but the resulting mode isn't CTR.
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midas007 4428 days ago
Yes it does, and it's still CTR.

Further, every solution is going to have other machinery solving specific concerns.

You don't call XTS something else because you've used scrypt or PBKDF2 as the PBKDF.

Work is work.

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tptacek 4428 days ago
This is a sequence of non-sequiturs, none of which respond to my comment. I'll make it easier for you:

Propose a scheme whereby you use AES-CTR to encrypt a 100 megabyte disk of 512-byte sectors, whereby the scheme "rekeys" every "few sectors". Be specific.

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midas007 4428 days ago
Don't need your "help," don't care.

"It's unreasonable to debate with an unreasonable person."

Bye.

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