Authors - Shivansh Dhar Singh, Tanay Mathur, Vanshita Verma, Rahul Chhabra, Imran Sayyed, Prashant Vats Abstract - A meticulous analysis of cryptographic protocols is required as the world of internet security experiences a revolutionary change with the approaching era of quantum computing. The dangers that quantum computing poses to present encryption standards are highlighted in this study piece, which explores the development of security systems from the prequantum to the post-quantum eras. In this transitional period, we examine the dangers and problems that internet security may face and offer a comprehensive examination of cryptographic solutions that are immune to quantum errors. Furthermore, we talk about the consequences for data integrity, secrecy, and authentication, among other areas of internet security. This study advances knowledge about the steps needed to protect our digital infrastructure from the impending age of quantum computing by thoroughly examining the transition from pre-quantum to post-quantum security.