1
David William Kravitz: Payment and transactions in electronic commerce system. Certco, IP Group of Pillsbury Madison & Sutro, February 22, 2000: US06029150 (594 worldwide citation)

A method of payment in an electronic payment system wherein a plurality of customers have accounts with an agent. A customer obtains an authenticated quote from a specific merchant, the quote including a specification of goods and a payment amount for those goods. The customer sends to the agent a s ...


2
Alan Asay, Paul A Turner, Frank W Sudia, Richard Ankney: Reliance server for electronic transaction system. Certco, Pillsbury Madison & Sutro, May 11, 1999: US05903882 (387 worldwide citation)

A method of managing reliance in an electronic transaction system includes a certification authority issuing a primary certificate to a subscriber and forwarding to a reliance server, information about the issued primary certificate. The reliance server maintains the forwarded information about issu ...


3
Frank Wells Sudia: Method for securely using digital signatures in a commercial cryptographic system. Certco, Cushman Darby & Cushman IP Group of Pillsbury Madison & Sutro, August 19, 1997: US05659616 (369 worldwide citation)

A system for securely using digital signatures in a commercial cryptographic system that allows industry-wide security policy and authorization information to be encoded into the signatures and certificates by employing attribute certificates to enforce policy and authorization requirements. In addi ...


4
Frank Wells Sudia: Enhanced cryptographic system and method with key escrow feature. Certco, Steptoe & Johnson, December 28, 1999: US06009177 (293 worldwide citation)

The invention provides a cryptographic system and method with a key escrow feature that uses a method for verifiably splitting users' private encryption keys into components and for sending those components to trusted agents chosen by the particular users, and provides a system that uses modern publ ...


5
Frank Wells Sudia: Enhanced cryptographic system and method with key escrow feature. CertCo, Steptoe & Johnson, August 25, 1998: US05799086 (223 worldwide citation)

A cryptographic system with key escrow feature that uses a method for verifiably splitting user's private encryption keys into components and for sending those components to trusted agents chosen by the particular users is provided. The system uses public key certificate management, enforced by a ch ...


6
Frank W Sudia, Alan Asay, Ernest F Brickell, Richard Ankney, Peter C Freund, Marcel M Yung, David W Kravitz: Electronic cryptographic packing. Certco, Pillsbury Madison & Sutro, November 30, 1999: US05995625 (156 worldwide citation)

A method of unwrapping wrapped digital data that is unusable while wrapped, includes obtaining an acceptance phrase from a user; deriving a cryptographic key from the acceptance phrase; and unwrapping the package of digital data using the derived cryptographic key. The acceptance phrase is a phrase ...


7
Ernest F Brickell, Frank W Sudia, David William Kravitz, Peter C Freund, Patrick J Angeles: Adaptive multi-step digital signature system and method of operation thereof. CertCo, Steptoe & Johnson, February 2, 1999: US05867578 (138 worldwide citation)

A multi-step digital signature system and method is provided having a distributed root certifying authority 20. Messages received at the root certifying authority 20 are distributed to root certifying authority members 22-30 who attach partial signatures to the message using root key fragments. In t ...


8
Frank Wells Sudia: Enhanced cryptographic system and method with key escrow feature. CertCo, Steptoe & Johnson, November 24, 1998: US05841865 (133 worldwide citation)

The invention provides a cryptographic system and method with a key escrow feature that uses a method for verifiably splitting users' private keys into components and for sending those components to trusted agents chosen by the particular users, and provides a system that uses a modern public key ce ...


9
Frank W Sudia, Peter C Freund, Stuart T F Huang: Multi-step digital signature method and system. CertCo, Steptoe & Johnson, March 27, 2001: US06209091 (108 worldwide citation)

A multi-step signing system and method uses multiple signing devices to affix a single signature which can be verified using a single public verification key. Each signing device posesses a share of the signature key and affixes a partial signature in response to authorization from a plurality of au ...


10
Frank Wells Sudia: Enhanced cryptographic system and method with key escrow feature. CertCo, Steptoe & Johnson, February 16, 1999: US05872849 (88 worldwide citation)

The invention provides a cryptographic system and method with a key escrow feature that uses a method for verifiably splitting users' private encryption keys into components and for sending those components to trusted agents chosen by the particular users, and provides a system that uses modern publ ...