Advancements in cryptography are shaping internet security by enhancing data protection and ensuring secure communications. Techniques such as public-key cryptography provide robust encryption methods that safeguard sensitive information from unauthorized access. These advancements help secure online transactions, protect personal data, and maintain the integrity of communications across various platforms. Additionally, the emergence of quantum cryptography poses new opportunities and challenges, potentially increasing security levels while requiring new approaches to encryption. As cyber threats continue to evolve, ongoing innovations in cryptography are essential to maintaining trust and safety in an increasingly digital world.