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VLDB
1998
ACM
105views Database» more  VLDB 1998»
15 years 1 months ago
Computing Iceberg Queries Efficiently
Many applications compute aggregate functions over an attribute (or set of attributes) to find aggregate values above some specified threshold. We call such queries iceberg querie...
Min Fang, Narayanan Shivakumar, Hector Garcia-Moli...
COMPSAC
2004
IEEE
15 years 1 months ago
A Novel Key Management Scheme for Dynamic Access Control in a User Hierarchy
Considering the solution of dynamic access problems in a user hierarchy, a novel scheme based on one-way hash function is proposed to manage the cryptographic keys in the paper. T...
Tzer-Shyong Chen, Yu-Fang Chung, Chang-Sin Tian
CSREASAM
2006
14 years 11 months ago
A New Robust and Secure Steganographic System for Greyscale Images
: The research work in this paper shows that the currently available stenographic methods might be quite easily detected by using sufficiently careful analysis of the transmitted d...
Hesham Elzouka
CTRSA
2009
Springer
128views Cryptology» more  CTRSA 2009»
15 years 4 months ago
Short Redactable Signatures Using Random Trees
Abstract. A redactable signature scheme for a string of objects supports verification even if multiple substrings are removed from the original string. It is important that the re...
Ee-Chien Chang, Chee Liang Lim, Jia Xu
INFOCOM
2009
IEEE
15 years 4 months ago
Null Keys: Limiting Malicious Attacks Via Null Space Properties of Network Coding
—The performance of randomized network coding can suffer significantly when malicious nodes corrupt the content of the exchanged blocks. Previous work have introduced error corr...
Elias Kehdi, Baochun Li