Abstract:
This research work represents the analysis of linear cryptanalysis of lightweight AES block ciphers.
The linear cryptanalysis is widely known as one of the primary tools for S- Box security design. The
AES is effective for fast, light and hardware reduction systems whereas the lightweight algorithm is
used for smooth application. Therefore, the S Box is usually used to obscure the connection between
the main text and the cipher text. This S Box design is basically two types: LUT S-Box and composite
S-Box. The composite S Box design is based on Affine Transformation (AT) where different affine
matrices and constants are used to enhance the security of the design. Hence, this research is focused
on using different affine constants to find affine transformation and linear cryptanalysis of different S
Boxes to examine the linear attacks on cipher text. The 4X4 affine matrix and 16 different affine
constants have been used for this work. The result has been evaluated on strong linear values among
16 different constants. Finally, the S-Box has been proposed according to the best linear values which
are more effective and sensible in data protection on lightweight AES block ciphers.
