Inventor
MATYAS JR STEPHEN M
US23 patents
⚠️ This page may combine multiple inventors who share the name “MATYAS JR STEPHEN M”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
IBM
22 patentsUS6102287AAug 15, 2000
Method and apparatus for providing product survey information in an electronic payment system
IBM242 citations99
US7519824B1Apr 14, 2009
Time stamping method employing multiple receipts linked by a nonce
IBM53 citations98
US6243470B1Jun 5, 2001
Method and apparatus for advanced symmetric key block cipher with variable length key and block
IBM83 citations97
US6058188AMay 2, 2000
Method and apparatus for interoperable validation of key recovery information in a cryptographic system
IBM168 citations97
US5592553AJan 7, 1997
Authentication system using one-time passwords
IBM565 citations97
US4850017AJul 18, 1989
Controlled use of cryptographic keys via generating station established control values
IBM194 citations97
US6307938B1Oct 23, 2001
Method, system and apparatus for generating self-validating prime numbers
IBM65 citations96
US6192129B1Feb 20, 2001
Method and apparatus for advanced byte-oriented symmetric key block cipher with variable length key and block
IBM67 citations96
US6185679B1Feb 6, 2001
Method and apparatus for a symmetric block cipher using multiple stages with type-1 and type-3 feistel networks
IBM66 citations96
US6185304B1Feb 6, 2001
Method and apparatus for a symmetric block cipher using multiple stages
IBM59 citations96
US5604801AFeb 18, 1997
Public key data communications system under control of a portable security device
IBM483 citations95
US6535607B1Mar 18, 2003
Method and apparatus for providing interoperability between key recovery and non-key recovery systems
IBM56 citations94
US4908861AMar 13, 1990
Data authentication using modification detection codes based on a public one way encryption function
IBM148 citations94
US6993656B1Jan 31, 2006
Time stamping method using aged time stamp receipts
IBM21 citations92
US6742119B1May 25, 2004
Time stamping method using time delta in key certificate
IBM33 citations92
US6345098B1Feb 5, 2002
Method, system and apparatus for improved reliability in generating secret cryptographic variables
IBM48 citations92
US6301362B1Oct 9, 2001
Method and apparatus for cryptographically transforming an input block into an output block
IBM45 citations92
US6189095B1Feb 13, 2001
Symmetric block cipher using multiple stages with modified type-1 and type-3 feistel networks
IBM52 citations92
US7490241B1Feb 10, 2009
Time stamping method employing user specified time
IBM15 citations84
US7315948B1Jan 1, 2008
Time stamping method employing a separate ticket and stub
IBM14 citations84
US7487359B2Feb 3, 2009
Time stamping method employing a separate ticket and stub
IBM6 citations74
US6965998B1Nov 15, 2005
Time stamping method using time-based signature key
IBM10 citations74