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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