A Modified Polybius Cipher with a New Element-in-Grid Sequencer
Jan Carlo T. Arroyo · International Journal of Advanced Trends in Computer Science and Engineering · 2020
This paper modifies the traditional Polybius square with a 5x5 grid through the introduction of a new dynamic substitution-based matrix for ciphertext assignment.The modification is done through the alteration of cell elements, where the ASCII decimal code equivalent of the key is the basis for the element positioning.The proposed enhanced Polybius square called ASCII Code-based Polybius Square Alphabet Sequencer (APSAlpS) is hoped to be used along with other lightweight cryptographic algorithms classified as block ciphers, stream ciphers, and hash functions in solving constrains identified in IoT.The use of the modified Polybius square along with other lightweight ciphers to establish a better IoT security is recommended.