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List:       cryptography
Subject:    [Fwd: 1/28/00 C.S. Colloquium]
From:       "R. A. Hettinga" <rah () shipwright ! com>
Date:       2000-01-26 0:22:57
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Subject: [Fwd: 1/28/00 C.S. Colloquium]
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==========================================================================


                     Department of Computer Science
                           Courant Institute
                          New York University


                       DEPARTMENTAL COLLOQUIUM

			   Allan Gottlieb
			 New York University


			     Intermemory


The Intermemory project proposes an autonomous, world wide distributed
system that will maintain information archivally and will offer
extremely high availability without the storage costs of a large
number of mirror sites.  Information is dispersed in a redundant
fashion so that only if an improbably large number of systems are down
can the data not be retrieved.  With one set of parameter values, an
availability level comparable to more than 500 mirror sites can be
obtained with a storage cost that is less than just 5 mirrors.

If one assumes that the long standing exponential growth in
bytes/dollar and hence bytes/system will continue, it can be shown
that a contribution of storage to the system for a finite time period
can entitle to the contributor to permanent ownership of (a smaller
amount of) system storage.  When exponential increases end, the
guarantees weaken but are still attractive.  The Intermemory project
exposes important questions in areas as diverse as cryptography and
DNS (domain name service).

Recently the project has begun investigating intramemories, that is
storage accessible throughout a smaller domain.  Applications range
from a single lan to a corporate-wide database.  A major difference is
that security is less of a concern since hosts are under a single
administrative domain.  Lowering the protection requirements will
result in higher performance.  When the system is
restricted to a single lan, further simplifications are available and
much higher performance is expected.

Our implementations to date have all required that the data to be
stored is write-once, i.e. immutable.  We continue to examine the
possiblility of full read-write support and believe that a system
based on a form of ``session semantics'' in which all updates to a
subtree are applied during a session of limited duration looks
promising.


Friday, January 28, 2000
11:30 a.m. - 12:30 p.m.
Room 101 Warren Weaver Hall
251 Mercer Street
New York, NY  10012-1185

Refreshments will be served in the Grumman Lounge from 11:00 - 11:30 a.m.
in 13th floor of Warren Weaver Hall.


Host: Allan Gottlieb, (gottlieb@cs.nyu.edu) (212) 998-3344
Directions: http://www.cs.nyu.edu/directions/new_wsq-campus.html
Colloquium Information: http://www.cs.nyu.edu/calendar2.html

==============================================================================

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-----------------
R. A. Hettinga <mailto: rah@ibuc.com>
The Internet Bearer Underwriting Corporation <http://www.ibuc.com/>
44 Farquhar Street, Boston, MA 02131 USA
"... however it may deserve respect for its usefulness and antiquity,
[predicting the end of the world] has not been found agreeable to
experience." -- Edward Gibbon, 'Decline and Fall of the Roman Empire'

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