Eric J. Sprunk
60Patents
17h-index
38Co-inventors
84Inventor score
Filing activity: Dec 21, 1993 → May 11, 2021
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US6061449A | Secure processor with external memory using block chaining and block re-ordering | Physics | 348 | Expired |
| US7243366B2 | Key management protocol and authentication system for secure internet protocol rights management architecture | Electricity | 69 | Expired |
| US6898285B1 | System to deliver encrypted access control information to support interoperability between digital information processing/control equipment | Electricity | 65 | Expired |
| US5404402A | Clock frequency modulation for secure microprocessors | Electricity | 59 | Expired |
| US6810525B1 | Impulse pay per use method and system for data and multimedia services | Electricity | 56 | Expired |
| US5754659A | Generation of cryptographic signatures using hash keys | Electricity | 50 | Expired |
| US6839841B1 | Self-generation of certificates using secure microprocessor in a device for transferring digital information | Physics | 46 | Expired |
| US6253223A | Robust random number generator | Physics | 45 | Expired |
| US8321663B2 | Enhanced authorization process using digital signatures | Electricity | 41 | Active |
| US7787622B2 | Efficient distribution of encrypted content for multiple content access systems | Electricity | 39 | Active |
| US5509076A | Apparatus for securing the integrity of a functioning system | Physics | 38 | Expired |
| US8761401B2 | System and method for secure key distribution to manufactured products | Electricity | 36 | Active |
| US6804782B1 | Countermeasure to power attack and timing attack on cryptographic operations | Physics | 27 | Expired |
| US5606616A | Cryptographic apparatus with double feedforward hash function | Electricity | 26 | Expired |
| US7660986B1 | Secure control of security mode | Electricity | 25 | Expired |
| US5822431A | Virtual authentication network for secure processors | Physics | 18 | Expired |
| US6711684B1 | Variable security code download for an embedded processor | Physics | 17 | Expired |
| US7404082B2 | System and method for providing authorized access to digital content | Electricity | 14 | Expired |
| US8392702B2 | Token-based management system for PKI personalization process | Electricity | 13 | Active |
| US9130928B2 | Online secure device provisioning framework | Electricity | 10 | Active |
| US6424713B1 | Cryptographic system with concealed work factor | Electricity | 10 | Expired |
| US6961427B1 | Methods and apparatus for keystream generation | Electricity | 10 | Expired |
| US7877600B2 | Method and apparatus for distributing root certification | Electricity | 9 | Active |
| US6959089B1 | Method and apparatus for secure transmission of data | Physics | 9 | Expired |
| US7450717B1 | Self authentication ciphertext chaining | Electricity | 9 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.