He worked as a tinsmith, a coppersmith, and a boilermaker. The simple shapes made by the tinsmith require tools similar to those of a coppersmith. They choose cavities made by woodpeckers and coppersmith barbets. The coppersmith barbet's range overlaps with several larger barbets in most of South Asia. John Safran was painted by Yvette Coppersmith and entered in the 2009 Archibald Prize. Yvette Coppersmith (born 1980) is an Australian painter; she specialises in portraiture and still life. Don Coppersmith (born 1950) is a cryptographer and mathematician. He worked as a tin plate worker and a coppersmith. It was introduced in their analysis of a discrete logarithm algorithm of Coppersmith. Among the items sold was a grand crucifix which went to a local coppersmith. A similar design was patented in 1904 by New York coppersmith J. Heinrichs. The first version was published by Phillip Rogaway and Don Coppersmith in 1994. The general case uses the Coppersmith method. However, his Democratic challenger, Sam Coppersmith, hammered Rhodes for several ethical lapses. The quantum Fourier transform was invented by Don Coppersmith.