A Systematic Information Collection Method for Business Intelligence

2009 ◽  
Author(s):  
Xingsen Li ◽  
Hongliang Qu ◽  
Zhengxiang Zhu ◽  
Yongsheng Han
Keyword(s):  
Business Intelligence ◽  
Information Collection ◽  
Collection Method ◽  
Systematic Information

An Improvement of the CS Attack to DSC Cipher

2019 ◽  
Vol 62 (8) ◽  
pp. 1158-1165
Author(s):  
Hanqiu Liu ◽  
Chenhui Jin
Keyword(s):  
Stream Cipher ◽  
Success Probability ◽  
Computation Time ◽  
Information Collection ◽  
Secret Key ◽  
Collection Method ◽  
Evaluation Indexes ◽  
Classification Technique ◽  
Known Plaintext Attack ◽  
Bit Stream

Abstract The DECT standard cipher (DSC) is a 64-bit stream cipher, which was used in the digital enhanced cordless telecommunications (DECT) standard to protect the privacy of users. The Coisel–Sanchez (CS) attack proposed by Coisel and Sanchez in CHES 2015 is the most effective cryptanalysis against the DSC cipher up to now. Based on the CS attack, we present an improved attack in which an information collection method with unknown memory is used to improve the utilization of information and the message classification technique is adopted to reduce the computation time of evaluation indexes. Meanwhile, we present an improved pre-sieving technique to avoid the computation of evaluation indexes of a large number of incorrect candidates. Our known plaintext attack requires only 2 min of communication compared to 3 min for the CS attack. By analyzing 213 keystreams, our approach is able to increase the success probability of retrieving secret key from 55–89%. As far as we know, the attack we present in this paper is the most effective one among the existing attacks to the DSC cipher.

Proposal of Disaster Information Collection Method by Robot

2018 ◽  
Author(s):  
Takahiro Uchiya ◽  
Kota Hayashi ◽  
Ryuta Sugie ◽  
Ichi Takumi ◽  
Tetsuo Kinoshita
Keyword(s):  
Information Collection ◽  
Collection Method ◽  
Disaster Information
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