The amazing story of an extraordinary person, Elizebeth Smith Friedman, America’s first cryptologist and codebreaker. She did most of her work in the first half of the 20th century, but some of the details of her life-story only came out recently. Find out why!
I do not know if this particular video will be blocked where you live, but you could do a search for her name (which, I assure you, I have spelt correctly!) and find other sources of information about her, including other videos.