scholarly journals On a Linear Cryptanalysis of a Family of Modified DES Ciphers with Even Weight S-Boxes

2016 ◽  
Vol 16 (4) ◽  
pp. 3-12 ◽  
Author(s):  
Yuri Borissov ◽  
Peter Boyvalenkov ◽  
Robert Tsenkov
Keyword(s):  
Data Encryption ◽  
General Situation ◽  
Linear Cryptanalysis ◽  
Parity Check ◽  
Data Encryption Standard ◽  
The Individual

Abstract We investigate the effect of inserting extra linearity in the Data Encryption Standard (DES) through appropriate nonsingular linear encodings of the output of the individual S-boxes. More specifically, we examine the general situation when the output of each S-box of the DESis precoded separately intoaproperly constructed copy of the inherent even-weight code of length 4. The study is focused on finding multi-round linear characteristics for thus modified DESciphers having maximal effectiveness. Depending on the particular encodings, it turns out that the effectiveness of interest may be larger but in most cases is smaller than that one for the original DESwith the same number of rounds. The latter means that the complexity of successful linear cryptanalysis against these ciphers will mainly increase comparing to the DESitself. The present research extends inanatural way our previous work[Linear Cryptanalysis and Modified DESwith Parity Check in the S-boxes, LNCS 9540 (2016), pp. 60-78].

scholarly journals Enhancing Security in Digital Data using various Function of S-box in Data Encryption Standard Method

Webology ◽  
2021 ◽  
Vol 18 (2) ◽  
pp. 767-789
Author(s):  
Leya Elizabeth Sunny ◽  
Dr. Varghese Paul
Keyword(s):  
Standard Method ◽  
Data Encryption ◽  
Differential Cryptanalysis ◽  
Digital Data ◽  
Linear Cryptanalysis ◽  
Data Encryption Standard ◽  
Plain Text ◽  
Cryptographic Algorithms

Stage of networking is quintessential task in which security comes into play. Securing these networks which contains confidential digital data that needs to secured will be the agenda of cryptography. Many cryptographic algorithms increment their strengths over parameters like key size, increasing the rounds of iteration and finally using confusion box as S-box as it has best robustness. So, this paper mainly focusses over securing digital data with the help of S-box function over Data Encryption Standard (DES) algorithm. For this, a plain text and key will be given to this DES as it extracts 8x8(64) bit characters from the key and converting them into its corresponding ASCII value and are concatenating to form an 8 value by taking mod16. These will give to 8 S-box in order to generate its corresponding output to make even more secure and also shows dynamic DES gives much result than other crypto methods. The evaluation of this integrated s-box and DES shows much fruitful results over factors like non-linearity, Avalanche criterion, Balance, Robustness to linear cryptanalysis, Robustness to differential cryptanalysis.

Bachelorhood and Sexuality in a Context of Female Shortage: Evidence from a Survey in Rural Anhui, China

2013 ◽  
Vol 215 ◽  
pp. 703-726 ◽  
Author(s):  
Isabelle Attané ◽  
Zhang Qunlin ◽  
Li Shuzhuo ◽  
Yang Xueyan ◽  
Christophe Z. Guilmoto
Keyword(s):  
Cultural Context ◽  
Family Formation ◽  
Rural Society ◽  
General Situation ◽  
Rural County ◽  
Chinese Men ◽  
Married Men ◽  
Exploratory Survey ◽  
The Individual ◽  
Near Future

AbstractTraditionally, marriage is a near universality in China. However, in the coming decades, owing to the growing sex imbalance, millions of men will be unable to marry. As a consequence, bachelorhood is becoming a new demographic concern, particularly affecting men from the most disadvantaged socio-economic groups. In China's cultural context today, heterosexual marriage remains a prerequisite for family formation and, in rural society particularly, the legitimate setting for sexual activity. Under such circumstances, bachelorhood is likely to produce privations on various fronts, the consequences of which for both the individual and the community are still largely unknown. This article focuses on the opinions and sexual behaviour of bachelors, and highlights significant variations from those of married men. It is based on the findings of an exploratory survey conducted in 2008 in selected villages in a rural county in Anhui province, referred to here as JC county. The survey provides insights into the more general situation of rural men unable to marry in a context of female shortage, and indicates the conditions a growing number of Chinese men will face in the near future.

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