Explore the CHES Test-of-Time Award Session, a 31-minute conference talk that delves into the background, significance, and impact of the award-winning paper. Learn about the masking notation, main discovery, improvements, generalizations, proofs, and applications that have made this research stand out in the field of cryptographic hardware and embedded systems. Gain insights into the selection process and the criteria used by the award committee to recognize groundbreaking contributions that have withstood the test of time.