Klaus Schmeh has written 15 books (mostly in German) about cryptography, as well as over 250 articles, 25 scientific papers, and 1500 blog posts. Klaus’s main fields of interest are codebreaking and the history of encryption. Klaus is a popular speaker, known for his entertaining presentation style involving self-drawn cartoons, self-composed songs, and Lego models. He has lectured at hundreds of conferences, including the NSA Crypto History Symposium, DEF CON, and the RSA Conference. In his day job, Klaus works as a crypto expert for the global IT security company Eviden.