G06F 2221/2103
Challenge-response
G06F2221/2103 (Challenge-response) appears on 1,338 US grants and 1,539 published applications in this corpus.
Search patents in G06F- Granted patents
- 1,338
- Published applications
- 1,539
- Assignees
- 626
- Inventors
- 2,958
- Latest grant
- 6 Oct 2026
Filings by year
| Year | Granted patents | Published applications |
|---|---|---|
| 1986 | 1 | 0 |
| 1987 | 2 | 0 |
| 1988 | 1 | 0 |
| 1989 | 1 | 0 |
| 1990 | 2 | 0 |
| 1991 | 2 | 0 |
| 1992 | 6 | 0 |
| 1993 | 0 | 0 |
| 1994 | 2 | 0 |
| 1995 | 4 | 0 |
| 1996 | 6 | 0 |
| 1997 | 3 | 0 |
| 1998 | 9 | 0 |
| 1999 | 7 | 0 |
| 2000 | 9 | 0 |
| 2001 | 11 | 1 |
| 2002 | 8 | 21 |
| 2003 | 8 | 16 |
| 2004 | 12 | 29 |
| 2005 | 10 | 36 |
| 2006 | 27 | 38 |
| 2007 | 21 | 48 |
| 2008 | 20 | 36 |
| 2009 | 18 | 60 |
| 2010 | 25 | 55 |
| 2011 | 39 | 47 |
| 2012 | 39 | 60 |
| 2013 | 57 | 67 |
| 2014 | 79 | 71 |
| 2015 | 87 | 90 |
| 2016 | 75 | 95 |
| 2017 | 79 | 77 |
| 2018 | 76 | 76 |
| 2019 | 83 | 88 |
| 2020 | 75 | 106 |
| 2021 | 93 | 86 |
| 2022 | 72 | 93 |
| 2023 | 75 | 70 |
| 2024 | 80 | 79 |
| 2025 | 73 | 57 |
| 2026 | 41 | 37 |
By publication year. Applications have been published since 2001. 2026 runs to 8 Oct.
Recent patents
- Authentication device, authentication system, and authentication method6 Oct 2026US 12,754,993 B2Mitsubishi Electric Corporation
- Systems and methods for password recovery within an untrusted environment22 Sep 2026US 12,743,499 B1Gen Digital Inc.
- Dynamic security challenge authentication22 Sep 2026US 12,743,532 B2
- Tamper proof transportation device22 Sep 2026US 12,743,559 B2University of Hertfordshire Higher Education Corporation
- System and method for user-specific captchas11 Aug 2026US 12,705,327 B1United Services Automobile Association (USAA)
- Methods and systems for determining the authenticity of a component8 Oct 2026US 2026/0310831 A1Lexmark International, Inc.
- Instrument-stem integrated system3 Sep 2026US 2026/0262184 A1
- Controlling resource access requests in containerized platform27 Aug 2026US 2026/0252717 A1International Business Machines Corporation
- Adaptive risk-based challenge system using conformal uncertainty calibration20 Aug 2026US 2026/0244721 A1Microsoft Technology Licensing, LLC
- Authenticating a user in liveness testing using a trusted camera13 Aug 2026US 2026/0236567 A1Capital One Services, LLC
Most cited
By later US patents
- Roving software license for a hardware agent593US 5,473,692 AIntel Corporation · 1995
- Physical presence digital authentication system591US 6,607,136 B1BeepCard Ltd. · 2003
- Techniques for user authentication565US 8,613,066 B1Amazon Technologies, Inc. · 2013
- Method and apparatus for utilizing a token for resource access542US 5,657,388 ASecurity Dynamics Technologies, Inc. · 1997
- Subscription access system for use with an untrusted network473US 6,516,416 B2Prism Resources · 2003