From mboxrd@z Thu Jan 1 00:00:00 1970 Message-ID: <3220ce5ba20c40077bcde180368a471b@quanstro.net> From: erik quanstrom Date: Tue, 4 Mar 2008 23:43:08 -0500 To: 9fans@cse.psu.edu Subject: Re: [9fans] thoughs about venti+fossil In-Reply-To: MIME-Version: 1.0 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit Topicbox-Message-UUID: 6f061a6c-ead3-11e9-9d60-3106f5b1d025 > On Mar 4, 2008, at 8:00 PM, Enrico Weigelt wrote: > > some thoughts about venti that go around in my mind: > > > > 1. how stable is the keying ? sha-1 has only 160 bits, while > > data blocks may be up to 56k long. so, the mapping is only > > unique into one direction (not one-to-one). how can we be > > *really sure*, that - even on very large storages (TB or > > even PB) - data to each key is alway (one-to-one) unique ? > > http://www.nmt.edu/~val/review/hash/index.html > > Not that this analysis is without flaws, though. have you invented the 9fans.net effect? this link may or may not be similar. but it is on point: http://www.valhenson.org/review/hash.pdf do you care to elaborate on the flaws of this analysis? - erik