Donald B. Johnson
64Patents
32h-index
49Co-inventors
88Inventor score
Filing activity: Apr 27, 1977 → Dec 28, 2012
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5319705A | Method and system for multimedia access control enablement | Electricity | 790 | Expired |
| US5414833A | Network security system and method using a parallel finite state machine adaptive active monitor and responder | Physics | 676 | Expired |
| US5592553A | Authentication system using one-time passwords | Electricity | 417 | Expired |
| US5937066A | Two-phase cryptographic key recovery system | Electricity | 325 | Expired |
| US5164988A | Method to establish and enforce a network cryptographic security policy in a public key cryptosystem | Electricity | 226 | Expired |
| US5200999A | Public key cryptosystem key management based on control vectors | Electricity | 221 | Expired |
| US5265164A | Cryptographic facility environment backup/restore and replication in a public key cryptosystem | Electricity | 219 | Expired |
| US5201000A | Method for generating public and private key pairs without using a passphrase | Electricity | 203 | Expired |
| US5142578A | Hybrid public key algorithm/data encryption algorithm key distribution method based on control vectors | Electricity | 203 | Expired |
| US5301231A | User defined function facility | Physics | 201 | Expired |
| US4941176A | Secure management of keys using control vectors | Electricity | 136 | Expired |
| US5661807A | Authentication system using one-time passwords | Electricity | 133 | Expired |
| US4918728A | Data cryptography operations using control vectors | Electricity | 127 | Expired |
| US5432849A | Secure cryptographic operations using control vectors generated inside a cryptographic facility | Physics | 126 | Expired |
| US5953420A | Method and apparatus for establishing an authenticated shared secret value between a pair of users | Electricity | 111 | Expired |
| US5796830A | Interoperable cryptographic key recovery system | Electricity | 96 | Expired |
| US6052469A | Interoperable cryptographic key recovery system with verification by comparison | Electricity | 90 | Expired |
| US6078667A | Generating unique and unpredictable values | Electricity | 75 | Expired |
| US4924515A | Secure management of keys using extended control vectors | Electricity | 70 | Expired |
| US5323464A | Commercial data masking | Electricity | 65 | Expired |
| US6446207B1 | Verification protocol | Electricity | 63 | Expired |
| US5103478A | Secure management of keys using control vectors with multi-path checking | Electricity | 57 | Expired |
| US5815573A | Cryptographic key recovery system | Electricity | 54 | Expired |
| US5007089A | Secure key management using programable control vector checking | Electricity | 51 | Expired |
| US6195433A | Private key validity and validation | Electricity | 50 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.