The proof-of-concept device hides nano-Morse messages inside tubular DNA structures, then uses molecular keys and AFM imaging to verify and decode them. Paper: A multiple-encrypted DNA device for secure communication. Image credit: AI-generated image created using ChatGPT/OpenAI In a recent research article published in the journal Science Advances, researchers developed a laboratory-scale, proof-of-concept multilayer deoxyribonucleic acid (DNA) origami encryption device that integrates multiple cryptographic functions to demonstrate confidentiality, integrity, and authenticity within a molecular communication workflow. DNA Cryptography and Nano-Morse The rapid evolution of computing and cryptographic technologies has heightened concerns over conventional data security. Traditional encryption methods, relying largely on complex mathematical problems, could face future threats if sufficiently capable quantum computers and practical quantum algorithms are developed. As a result, alternative molecular-level cryptographic systems have garnered attention. DNA, with its enormous information storage capacity, programmability, and nanostructural versatility, offers a unique platform for secure communication. DNA nanotechnology, especially DNA origami, enables the precise spatial arrangement of molecular features, presenting an opportunity to encode information not only via DNA sequence but also through structural configurations. Integrating multiple encryption protocols into a coherent DNA origami-based communication system, however, poses significant challenges. DNA Origami Encoding Design At the core of this study is the design of a DNA multilayer encryption (DMLE) device that exploits rectangular DNA origami substrates to encode messages as nano-Morse code. The nano-Morse code is established by spatially mapping Morse symbols onto the origami surface. Dots are represented by paired dumbbell-shaped DNA bulge loops anchored on specific staple strands, spaces by vacant regions, and dashes by double-stranded DNA paths formed through localized hybridization chain reactions (HCRs). A comprehensive nano-Morse codebook mapping numerical digits and letters of the alphabet to these structural patterns was created. Multiple rectangular DNA origami substrates bearing encoded symbols were interconnected through elongated staples to