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Your search returned 61 patents.
( 713/177 in Current US Classification ) |
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| Patent ID | Title | Date Filed |
| 5568554 | Method for improving the processing and storage performance of digital signature schemes
| January 31, 1995 |
| 5499293 | Privacy protected information medium using a data compression method
| January 24, 1995 |
| 5490217 | Automatic document handling system
| March 5, 1993 |
| 5479509 | Method for signature of an information processing file, and apparatus for implementing it
| April 6, 1994 |
| 5465299 | Electronic document processing system and method of forming digital signature
| November 29, 1993 |
| 5432852 | Large provably fast and secure digital signature schemes based on secure hash functions
| September 29, 1993 |
| 5373561 | Method of extending the validity of a cryptographic certificate
| December 21, 1992 |
| 5347581 | Verification process for a communication system
| September 15, 1993 |
| 5231666 | Cryptographic method for updating financial records
| April 20, 1992 |
| 5226079 | Non-repudiation in computer networks
| October 16, 1991 |
| 5161189 | Encryption and decryption of chained messages
| March 11, 1991 |
| 5150409 | Device for the identification of messages
| January 19, 1990 |
| 5136646 | Digital document time-stamping with catenate certificate
| March 8, 1991 |
| 4991210 | Unpredictable blind signature systems
| May 4, 1989 |
| 4933969 | Data authentication and protection system
| March 1, 1988 |
| 4881264 | Digital signature system and method based on a conventional encryption function
| July 30, 1987 |
| 4661658 | Offline PIN validation with DES
| February 12, 1985 |
| 4309569 | Method of providing digital signatures
| September 5, 1979 |
| RE34954 | Method for secure time-stamping of digital documents
| November 22, 1993 |
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