Quantum Authentication and Encryption with Key Recycling

Explore a groundbreaking paper on quantum cryptography presented at Eurocrypt 2017. Delve into the concepts of quantum authentication and encryption with key recycling, as introduced by researchers Serge Fehr and Louis Salvail. Learn about the general idea behind these techniques, comparing encryption with key recycling to one-key distillation. Examine the intricacies of authentication with key recycling and analyze a potential attack scenario. Understand the formal statement of the concept, albeit informally explained, and follow the proof's easier aspects. Investigate extensions to the core ideas and grapple with the challenges posed by error correction in quantum systems. Conclude with a comprehensive overview of the implications and potential applications of this innovative approach to quantum cryptography.