Inventor
CHAUM DAVID
US30 patents
⚠️ This page may combine multiple inventors who share the name “CHAUM DAVID”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
CHAUM DAVID
19 patentsUS5276736AJan 4, 1994
Optionally moderated transaction systems
CHAUM DAVID159 citations99
US5131039AJul 14, 1992
Optionally moderated transaction systems
CHAUM DAVID132 citations99
US4947430AAug 7, 1990
Undeniable signature systems
CHAUM DAVID159 citations99
US4926480AMay 15, 1990
Card-computer moderated systems
CHAUM DAVID507 citations99
US4914698AApr 3, 1990
One-show blind signature systems
CHAUM DAVID180 citations99
US4529870AJul 16, 1985
Cryptographic identification, financial transaction, and credential device
CHAUM DAVID679 citations99
US6318137B1Nov 20, 2001
Electronic lock that can learn to recognize any ordinary key
CHAUM DAVID124 citations98
US4991210AFeb 5, 1991
Unpredictable blind signature systems
CHAUM DAVID139 citations98
US4987593AJan 22, 1991
One-show blind signature systems
CHAUM DAVID131 citations98
US4949380AAug 14, 1990
Returned-value blind signature systems
CHAUM DAVID148 citations98
US10375042B2Aug 6, 2019
Precomputed and transactional mixing
CHAUM DAVID39 citations94
US7516891B2Apr 14, 2009
Ballot integrity systems
CHAUM DAVID40 citations92
US7210617B2May 1, 2007
Secret-ballot systems with voter-verifiable integrity
CHAUM DAVID37 citations92
US10050786B2Aug 14, 2018
Random sample elections
CHAUM DAVID3 citations73
US8162215B2Apr 24, 2012
Scan-integrity election systems
CHAUM DAVID3 citations63
US11403903B2Aug 2, 2022
Random sample elections
CHAUM DAVID0 citations62
US11184338B2Nov 23, 2021
Precomputed and transactional mixing
CHAUM DAVID0 citations62
US8123114B2Feb 28, 2012
Hidden-code voting and marking systems
CHAUM DAVID1 citations52
US10536670B2Jan 14, 2020
Video copy prevention systems with interaction and compression
CHAUM DAVID0 citations42
(unassigned)
4 patentsDIGICASH INC
4 patentsUS5712913AJan 27, 1998
Limited-traceability systems
DIGICASH INC137 citations98
US5878140AMar 2, 1999
Limited-traceability systems
DIGICASH INC37 citations96
US5781631AJul 14, 1998
Limited-traceability systems
DIGICASH INC37 citations96
US5956400ASep 21, 1999
Partitioned information storage systems with controlled retrieval
DIGICASH INC243 citations95