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revision 1.65 by hemppah, Mon Feb 24 13:36:48 2003 UTC revision 1.66 by hemppah, Mon Feb 24 13:44:42 2003 UTC
# Line 1650  block by re-computing hash value for a s Line 1650  block by re-computing hash value for a s
1650  form the network. Indeed, all scroll blocks' identifiers are  form the network. Indeed, all scroll blocks' identifiers are
1651  self-certifying. However, this not very efficient if we want to  self-certifying. However, this not very efficient if we want to
1652  obtain large amounts of data. One possibility is to use tree-based  obtain large amounts of data. One possibility is to use tree-based
1653  hash techiques (e.g., \cite{merkle87hashtree}, \cite{\cite{mohr02thex}),  hash techiques (e.g., \cite{merkle87hashtree}, \cite{mohr02thex}),
1654  which makes possible multisource downloads. Tree based hash functions can be used  which makes possible multisource downloads. Tree based hash functions can be used
1655  to verify fixed length segments of data file, instead of whole data file.  to verify fixed length segments of data file, instead of whole data file.
1656  Currently, Shareaza \cite{shareazaurl}, Overnet \cite{overneturl} and  Currently, Shareaza \cite{shareazaurl}, Overnet \cite{overneturl} and
1657  eDonkey2000 \cite{edonkey2kurl} uses tree based hashing for validating  eDonkey2000 \cite{edonkey2kurl} uses tree based hashing for validating
1658  segments of a data file. Another options for more efficient data  segments of a data file. Another option, for more efficient data
1659  fething is use multisource downloading (\cite{bittorrenturl}) and online  fething, is use to standard multisource downloading \cite{bittorrenturl} and
1660  codes (\cite{maymounkov03ratelesscodes}).  online codes \cite{maymounkov03ratelesscodes}.
1661    
1662  Multisource downloads can be very useful when video, images or sound  Multisource downloads can be very useful when media such as video, images
1663  is stored using Storm storage model. However, further research is  or sound is stored under Storm storage model. However, further research is
1664  required.  required.
1665    
1666  For more detailed discussion about Storm's storage model, see  For more detailed discussion about Storm's storage model, see

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