大卫·乔姆，David Lee Chaum is an American computer scientist and cryptographer. He is famous for developing ecash, an electronic cash application that aims to preserve a user’s anonymity. He has also invented many cryptographic protocols and founded DigiCash, an electronic money corporation.His 1981 paper, "Untraceable Electronic Mail, Return Addresses, and Digital Pseudonyms", laid the groundwork for the field of anonymous communications research.