Mr. Gautam Kanwar

Building Secure End-to-End Encrypted Mobile Messaging Applications: Cryptographic Design, Key Management, and Real-Time Privacy Assurance

Abstract:

With over 4.3 billion active mobile messaging users worldwide and rising concerns over data interception, building truly secure communication systems has become a paramount engineering challenge. This session presents a deep dive into the design and implementation of an end-to-end encrypted mobile messaging application, focusing on cryptographic rigor, secure key management, and scalable real-time communication architecture. The presentation examines how Elliptic Curve Diffie-Hellman (ECDH) and AES-256-GCM encryption can provide robust confidentiality and integrity. At the same time, Perfect Forward Secrecy (PFS) ensures that even if session keys are compromised, past messages remain protected. Attendees will gain insights into how secure key exchange mechanisms, such as those inspired by the Signal Protocol, achieve verifiable trust between devices. From an architectural perspective, the talk examines low-latency message delivery using WebSockets and MQTT, complemented by secure REST APIs for authentication and synchronization across distributed mobile clients. It also presents metrics demonstrating encryption overheads, message latency under varying loads, and strategies for optimizing cryptographic operations on mobile devices without sacrificing user experience. By combining theoretical cryptography with real-world engineering data, this session equips developers, architects, and security engineers with actionable insights to design privacy-preserving messaging systems capable of scaling securely to millions of users.

Profile:

Gautam Kanwar is an engineering leader with over 17 years of experience building and scaling flagship consumer products at Meta and high-growth startups. At Meta, he led initiatives such as Edits by Instagram, Encrypted Backups for Messenger and Instagram, and Android system infrastructure for Portal. As a Software Engineering Manager for WhatsApp Business, he drove user acquisition and engagement through feature innovation and data-driven product optimization. Previously, Gautam served as CTO at Vyng, where he developed a patented video ringtone and spam-blocking dialer with over 17 million downloads, leading to its successful acquisition. He was also a founding engineer at Hike Messenger, helping scale the platform to 35 million users. His expertise spans mobile platforms, privacy and security infrastructure, real-time systems, and AI-driven applications. An alumnus of IIT Delhi, Gautam is passionate about combining product vision, technical architecture, and team leadership to deliver impactful global products. Affiliation: Staff Software Engineer at Meta Platforms Inc Thanks & Regards Gautam Kanwar