Unlock the future of cryptology with seminal research presented at INDOCRYPT 2004 in Chennai, India. This proceedings volume showcases 30 top-tier, peer-reviewed papers, rigorously selected from international submissions, offering critical insights into advanced cryptographic algorithms and secure communication. An indispensable resource for computer science scholars, cybersecurity professionals, and researchers across India keen to grasp the latest breakthroughs in information security. Discover the forefront of cryptographic innovation curated from this significant conference.