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CRYPTO
1990
Springer
78views Cryptology» more  CRYPTO 1990»
15 years 10 months ago
How to Time-Stamp a Digital Document
The prospect of a world in which all text, audio, picture, and video documents are in digital form on easily modi able media raises the issue of how to certify when a document was...
Stuart Haber, W. Scott Stornetta
NSDI
2008
15 years 9 months ago
Freezing More Than Bits: Chilling Effects of the OLPC XO Security Model
In this paper, we discuss Bitfrost, the security model developed by the One Laptop Per Child project for its XO laptop computers. Bitfrost implements a number of security measures...
Meredith L. Patterson, Len Sassaman, David Chaum
MP
2010
132views more  MP 2010»
15 years 1 months ago
Exploiting group symmetry in semidefinite programming relaxations of the quadratic assignment problem
We consider semidefinite programming relaxations of the quadratic assignment problem, and show how to exploit group symmetry in the problem data. Thus we are able to compute the b...
Etienne de Klerk, Renata Sotirov
CHI
2003
ACM
16 years 7 months ago
Intuitive visualizations for presence and recency information for ambient displays
The Semi-Public Displays project utilizes public displays to assist in the interactions of small groups. This paper describes a set of visualizations for presence information of g...
Jaroslav Tyman, Elaine M. Huang
PODS
2004
ACM
130views Database» more  PODS 2004»
16 years 6 months ago
Computational Complexity of Itemset Frequency Satisfiability
Computing frequent itemsets is one of the most prominent problems in data mining. We introduce a new, related problem, called FREQSAT: given some itemset-interval pairs, does ther...
Toon Calders