scholarly journals The Substitution Principle Revisited

2018 ◽  
Vol 37 (3) ◽  
pp. 150-157 ◽  
Author(s):  
Jakub Stejskal
Keyword(s):  
Substitution Principle

Image Encryption Algorithm Based on Substitution Principle and Shuffling Scheme

2020 ◽  
Vol 38 (3B) ◽  
pp. 98-103
Author(s):  
Atyaf S. Hamad ◽  
Alaa K. Farhan
Keyword(s):  
Image Encryption ◽  
Chaotic Map ◽  
Logistic Map ◽  
Encryption Algorithm ◽  
Second Phase ◽  
Cipher Text ◽  
The Face ◽  
Substitution Principle ◽  
2D Logistic Map ◽  
Image Encryption Algorithm

This research presents a method of image encryption that has been designed based on the algorithm of complete shuffling, transformation of substitution box, and predicated image crypto-system. This proposed algorithm presents extra confusion in the first phase because of including an S-box based on using substitution by AES algorithm in encryption and its inverse in Decryption. In the second phase, shifting and rotation were used based on secrete key in each channel depending on the result from the chaotic map, 2D logistic map and the output was processed and used for the encryption algorithm. It is known from earlier studies that simple encryption of images based on the scheme of shuffling is insecure in the face of chosen cipher text attacks. Later, an extended algorithm has been projected. This algorithm performs well against chosen cipher text attacks. In addition, the proposed approach was analyzed for NPCR, UACI (Unified Average Changing Intensity), and Entropy analysis for determining its strength.

A Method for Generating Geared Links From Linkages

1994 ◽  
Author(s):  
Wan Wang ◽  
Guen Xie Li ◽  
Yong Zhong Tao
Keyword(s):  
Computer Programs ◽  
Topological Graph ◽  
Substitution Principle

Abstract A concept of generating geared links by inverting general linkages is proposed, which is based on the topological graph, and applies substitution principle of mechanisms. It makes it possible to apply the methods, data and computer programs of general linkages to geared links.

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