[tahoe-dev] usage of key file or smart card?

Stefan Xenon stefanxe at gmx.net
Mon Nov 23 21:43:31 UTC 2009


How can a user configure if to use a per-file encryption or convergent
encryption?

AFAIK the key is included in the cap. With per-file encryption does the
user need to note the cap for each file? How does this work for a backup
scenario where the user also needs to backup the keys (separately) but
which is not possible if the amount of keys depends on the amount of files?

> So, random-key encryption is really 128-bit. Convergent encryption
> is 128-bit with the caveat that an attacker can confirm a guess for
> the file contents if they know the "convergence secret". See
> <http://allmydata.org/pipermail/tahoe-dev/2008-August/000742.html> and
> <http://allmydata.org/pipermail/tahoe-dev/2008-March/000449.html>.
> 
> 
> 
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