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Contemporary communication infrastructure collapses precisely when it is needed most — during
natural disasters, network outages, and connectivity deprived environments. This paper presents Epistle, an offline first
peertopeer (P2P) disaster communication system that enables seamless devicetodevice messaging without any
dependency on the internet or centralized servers. The system leverages WiFi Direct and Bluetooth technologies to
form a self-organizing mobile mesh network, where each Android device simultaneously functions as a sender,
receiver, and relay node. A hybrid encryption scheme combining AES symmetric encryption for broadcast messages
and RSAAES asymmetric encryption for private communications ensures data confidentiality and integrity throughout.
The architecture follows the ModelViewViewModel (MVVM) pattern, enabling modular, scalable, and maintainable
code. Experimental results demonstrate successful broadcast messaging, private encrypted chat, GPS based location
sharing, photo transmission, emergency SOS broadcasting, and a radar-based peer discovery interface — all operating
entirely offline. The proposed system achieves reliable multiloop message relay across mesh nodes, maintaining
communication where conventional systems fail, making it directly applicable to disaster response, remote area
connectivity, and emergency coordination scenarios
"AN OFFLINEFIRST PEERTOPEER DISASTER COMMUNICATION SYSTEM BY MOBILE MESH NETWORKING", International Journal for Research Trends and Innovation (www.ijrti.org), ISSN:2456-3315, Vol.11, Issue 5, page no.b573-b584, May-2026, Available :http://www.ijrti.org/papers/IJRTI2605165.pdf
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2456-3315 | IMPACT FACTOR: 8.14 Calculated By Google Scholar| ESTD YEAR: 2016
An International Scholarly Open Access Journal, Peer-Reviewed, Refereed Journal Impact Factor 8.14 Calculate by Google Scholar and Semantic Scholar | AI-Powered Research Tool, Multidisciplinary, Monthly, Multilanguage Journal Indexing in All Major Database & Metadata, Citation Generator