Explore cryptanalysis techniques for Merkle-Damgård based Message Authentication Codes (MACs) in this conference talk from Eurocrypt 2012. Delve into the fundamentals of message authentication, hash functions, and secret prefix security proofs. Examine attack frameworks, including previous and generic approaches, while understanding basic ideas, internal cohesion, and range simulation. Learn about the almost universal forgery attack, its potential applications, and the diamond structure used in generic distinction. Gain insights into future research directions in the field of cryptanalysis on MACs.