* Roman Shaposhnik <[EMAIL PROTECTED]> wrote: > 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
Tells me what I already suspected: compare-by-hash can be an dangerous game (even if very uncertain). So I wouldn't count current venti secure and stable if one storage is large and used for a long time. cu -- --------------------------------------------------------------------- Enrico Weigelt == metux IT service - http://www.metux.de/ --------------------------------------------------------------------- Please visit the OpenSource QM Taskforce: http://wiki.metux.de/public/OpenSource_QM_Taskforce Patches / Fixes for a lot dozens of packages in dozens of versions: http://patches.metux.de/ ---------------------------------------------------------------------
