Open AccessAn Optimized Key Scheduling Algorithm for CAST -128 using dynamic substitution S-box
Author(s) -
Rekha C*,
Krishnamurthy G.N
Publication year - 2019
Publication title -
international journal of recent technology and engineering
Language(s) - English
Resource type - Journals
ISSN - 2277-3878
DOI - 10.35940/ijrte.c4920.098319
Subject(s) - s box , computer science , block cipher , substitution (logic) , key (lock) , algorithm , scheduling (production processes) , block (permutation group theory) , cipher , encryption , cryptography , mathematical optimization , mathematics , computer network , programming language , geometry , computer security
An optimized key scheduling algorithm for the 64-bit block cipher CAST-128 by using dynamically substituting of S-box. In this regard, an attempt has been made to modify key scheduling algorithm for generating subkeys of a secret-key block cipher which is CAST-128 algorithm so as to enhance performance by modifying the generation of subkeys using dynamic substitution of S-box. The CAST-128 uses four static substitution of S-box to generate subkeys, where as the proposed structure generates subkeys using substitution of S-box dynamically to provides the performance of CAST-128. The approach considers different security aspects and metrics evaluation for verification