Charles W. Kaufman
78Patents
30h-index
109Co-inventors
91Inventor score
Filing activity: Apr 28, 1988 → Sep 12, 2022
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5224163A | Method for delegating authorization from one entity to another through the use of session encryption keys | Electricity | 350 | Expired |
| US5666415A | Method and apparatus for cryptographic authentication | Electricity | 348 | Expired |
| US5491752A | System for increasing the difficulty of password guessing attacks in a distributed authentication scheme employing authentication tokens | Physics | 249 | Expired |
| US5220604A | Method for performing group exclusion in hierarchical group structures | Emerging Cross-Sectional Technologies | 196 | Expired |
| US5497421A | Method and apparatus for protecting the confidentiality of passwords in a distributed data processing system | Physics | 193 | Expired |
| US5261002A | Method of issuance and revocation of certificates of authenticity used in public key networks and other systems | Electricity | 171 | Expired |
| US6061799A | Removable media for password based authentication in a distributed system | Electricity | 168 | Expired |
| US5418854A | Method and apparatus for protecting the confidentiality of passwords in a distributed data processing system | Physics | 152 | Expired |
| US5500860A | Router using multiple hop redirect messages to enable bridge like data forwarding | Electricity | 149 | Expired |
| US5787169A | Method and apparatus for controlling access to encrypted data files in a computer system | Physics | 132 | Expired |
| US5081678A | Method for utilizing an encrypted key as a key identifier in a data packet in a computer network | Electricity | 120 | Expired |
| US5018137A | Transparent load sharing for parallel networks | Electricity | 104 | Expired |
| US5796830A | Interoperable cryptographic key recovery system | Electricity | 96 | Expired |
| US5764772A | Differential work factor cryptography method and system | Electricity | 91 | Expired |
| US6052469A | Interoperable cryptographic key recovery system with verification by comparison | Electricity | 90 | Expired |
| US5574860A | Method of neighbor discovery over a multiaccess nonbroadcast medium | Electricity | 83 | Expired |
| US5128926A | Updating link state information in networks | Electricity | 77 | Expired |
| US6178508A | System for controlling access to encrypted data files by a plurality of users | Physics | 66 | Expired |
| US5664099A | Method and apparatus for establishing a protected channel between a user and a computer system | Physics | 65 | Expired |
| US6094721A | Method and apparatus for password based authentication in a distributed system | Electricity | 64 | Expired |
| US5070528A | Generic encryption technique for communication networks | Electricity | 63 | Expired |
| US5086469A | Encryption with selective disclosure of protocol identifiers | Electricity | 63 | Expired |
| US5483598A | Message encryption using a hash function | Electricity | 59 | Expired |
| US5815573A | Cryptographic key recovery system | Electricity | 54 | Expired |
| US5796740A | Router using multiple hop redirect messages to enable bridge like data forwarding | Electricity | 50 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.