how to encrypt and integrity-check with only one key
Zooko Wilcox-O'Hearn
zooko at zooko.com
Mon Sep 14 21:18:25 EDT 2009
following-up to my own post:
On Monday,2009-09-14, at 10:22 , Zooko Wilcox-O'Hearn wrote:
> David-Sarah Hopwood suggested the improvement that the integrity-
> check value "V" could be computed as an integrity check (i.e. a
> secure hash) on the K1_enc in addition to the file contents.
Oops, that's impossible. What David-Sarah Hopwood actually said was
that this would be nice if it were possible, but since it isn't then
people should pass around the tuple of (v, K1_enc) whenever they want
to verify the integrity of the ciphertext.
http://allmydata.org/pipermail/tahoe-dev/2009-September/002798.html
Regards,
Zooko
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