David Chaum is the inventor of many cryptographic protocols, including blind signature schemes, commitment schemes, and digital cash... His contributions to cryptography include the invention of two anonymity networks: mix networks (the basis for virtually all modern anonymity networks) and DC-Nets; silo watching techniques; invention of several important digital signatures: blind signatures, undeniable signatures, unconditionally secure signatures, and group signatures; tamper-safing sensor systems (foreshadowing many concepts in side-channel cryptanalysis); various techniques for anonymous credentials, invention of partial key techniques (a predecessor to threshold encryption); first techniques for anonymous digital transactions and the invention of digital cash; early zero-knowledge proof techniques; multiparty computations; and the invention of cryptographic voting. He also performed notable cryptanalysis of DES and the RSA signature scheme.
Currently, Chaum heads the Punch Scan and Scan Tegrity projects - open-source, end-to-end auditable EVoting initiatives based on cryptographic principles.
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