[tahoe-dev] [tahoe-lafs] #217: DSA-based mutable files -- small URLs, fast file creation

tahoe-lafs trac at allmydata.org
Wed Jan 6 18:18:32 UTC 2010

#217: DSA-based mutable files -- small URLs, fast file creation
 Reporter:  zooko                   |           Owner:  zooko     
     Type:  enhancement             |          Status:  assigned  
 Priority:  major                   |       Milestone:  eventually
Component:  code-mutable            |         Version:  0.7.0     
 Keywords:  mutable crypto newcaps  |   Launchpad_bug:            

Comment(by davidsarah):

 I'm confused. Shortening the read caps does not depend on ECDSA. The semi-
 private key approach depends on ECDSA (to get ~2K bit read caps), but that
 approach doesn't give the shortest read caps. The mutable read caps in the
 Elk Point designs would be about K+50 bits, i.e. nearly a 1/3rd shorter,
 regardless of public key algorithm, and without depending on semi-private
 keys. (The immutable read caps are also 1/3rd shorter -- 2K instead of

 [This is the size of the cryptovalues; there is obviously some fixed
 overhead in the URL encoding.]

Ticket URL: <http://allmydata.org/trac/tahoe/ticket/217#comment:59>
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