Explore the security implications of truncation in pseudorandom functions (PRFs) through this 25-minute conference talk. Delve into the tight bounds for keyed sponges and truncated CBC, examining their exact PRF security. Learn about HMAC, sponge construction, and the random permutation model. Understand distinguishers and how to exploit message length. Gain insights into the intuition and challenges of proofs in this context. Discuss the key problems in the standard model, keeper pending issues, and open problems in the field of cryptography.