The multimedia technologies are gaining a lot of popularity these days.

Applying the modified Playfair algorithm in image steganography or password security is recommended for future works, and other performance metrics such as the randomness test and brute force attack analysis be tested. Simulation results revealed that the modified Playfair algorithm obtained an average of 53.54% avalanche effect when tested using plaintext with varying lengths ranging from 10 to 1000 characters, thus, surpassing the Strict Avalanche Criterion (SAC) standard. The generated ciphertext will only contain printable ASCII characters.

The enhanced Playfair algorithm will pave the way for a robust system to secure information where similar plaintext characters may not have the same encryption value. The proposed modification incorporates matrix rotation, matrix shifting, matrix rolling, and crossover operations in producing the ciphertext. A 16x16 dynamic matrix with a new character sequencing scheme is introduced before substitution for a more secure encryption process. This study enhanced the Playfair algorithm with the novel Multidimensional Element-in-Grid Sequencer (MEGS).

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