Explore a conference talk on perfect correctness in cryptography through derandomization techniques. Delve into the importance of eliminating negligible errors in cryptographic schemes, focusing on the work presented by Nir Bitansky and Vinod Vaikuntanathan at Eurocrypt 2017. Examine the role of randomness in cryptography, learn about the concept of avoiding errors, and understand the basic ideas behind achieving perfect correctness. Investigate NW-PRGs and their significance in this context, as well as methods for correcting cryptographic schemes, particularly in public-key encryption. Discover the process of decoupling correctness and security, and gain insights into enumeration techniques and the concept of cryptographic strings. Conclude with a comprehensive recap of the presented ideas and their implications for the field of cryptography.