PRESENT Block Cipher Defined over Galois-Field ( \(2^8\) )

PRESENT block cipher, well known for its hardware efficiency among tiny computing environments, safeguards data from adversaries and various cyber attacks. To support lightweight implementation, it utilizes the 4-bit S-box, making it unsuitable for 8-bit word architecture based embedded devices. As per NSA reports, it is evident that such reductions in size reduces the security levels. In this paper, a new variant of PRESENT is proposed that optimizes the basic structure of PRESENT with 4-bit S-box to 8-bit S-box and is based on the Galois-Field ( \(2^8\) ). This new variant of PRESENT provides the highest security strength among existing PRESENT in Galois-Field ( \(2^4\) ) and other contemporary approaches in Galois-Field ( \(2^8\) ), evaluated through Avalanche of Change. The cipher text it generates demonstrates optimal randomness, validated by NIST testing suite. Further, the proposed variant minimizes memory requirements, standing out among Galois-Field ( \(2^8\) ) block ciphers.