The Efficacy of \(\alpha \) -Channels in PNG Image File Format for Covert Communication

Effective tactical communications are crucial in gathering intelligence and exchanging mission-related information within a group, particularly in hostile underground activities. Leveraging technology in diverse environments enables efficient, reliable, and secure communication. Covert communications are robust for clandestine information transfer and dissemination during conflicts or political struggles. Proficiency in anonymous communication and establishing traceless networks is vital for the success of underground operations. This study emphasizes the importance of covert communication in ensuring security and privacy. Alpha channels in image editing software can manipulate and store transparent information, making them a promising medium for covert communication. This research aimed at evolving a reversible image Steganography technique for the PNG file format to insert alpha channels for covert information exchange. Test results for MSE, PSNR, and SSIM remained optimal. Our proposed logic operates in real-time as a one-time process (OTP) when used with non-repeated Stegokeys with a True Random Number Generator (TRNG).