Roger Sherwood Schlafly

7516491, Apr 7, 2009

Apr 2, 2003

10/405153

Roger Schlafly - Scotts Valley CA, US

H04K 1/00
G06F 7/04
G06F 17/30
H04L 9/00

726 26, 713155, 705 64, 380282

A method and system for remotely maintaining data that is critical for license enforcement. The data consists of named values, is kept on a user's trusted platform, and encrypted with the use of keys that are stored in two special registers. One register is exclusively readable by a trusted program, and holds a long-term secret. Another register is exclusively writable, and changed often, so that old backups of the named values can only be read if suitable permissions are obtained. It uses a hierarchy of servers that act as vendors and have contractual obligations. Vendor certificates specify that certain named values are stored on users' trusted platforms, but owned and controlled by servers (with the cooperation of the users).

7568114, Jul 28, 2009

Jun 25, 2007

11/821613

Roger Schlafly - Scotts Valley CA, US

G06F 11/30

713194, 713173, 713176, 713193, 705 64

A method and system for securely and efficiently processing transactions on a client computer with secure and insecure components. A secure transaction module runs on the secure components and uses certificates to authenticate client/server transactions. Users can fill in server-supplied forms with a very high degree of confidence that no malicious software has interfered, and that the server will get exactly what the user intended. The module maintains some tamper-resistant storage with labels indicating that certain registers can only be changed based on cryptographically secured commands from remote server domains. If such registers are scarce, then additional ones are simulated. Applications include managing online accounts, purchase of monetary credits that can be spent online, moving credentials on and off smart cards, using proxy signers to divide certificate authority responsibilities, creating self-destructing email documents, and digital rights management.

56005849, Feb 4, 1997

Sep 15, 1992

7/945262

Roger Schlafly - Soquel CA

G06F 738
G06F 314
G06F 1130

364745

A method for tracking errors in a system of numerical formulas. It uses confidence intervals and special encodings, and is suitable for use in an interactive computer program. Maximum efficiency and accuracy are attained by using directed rounding and compiling into native code.

52991970, Mar 29, 1994

Feb 11, 1992

7/835159

Roger Schlafly - Soquel CA

H04J 324

370 941

A method for interactive transmission of information from one computer to others across communications channels. A computer server sends asynchronous packets of data based on requests from remote terminals. The packets are interpreted in a way that allows efficient transmission of text, pictures, menus, files, and programs.

52747077, Dec 28, 1993

Dec 6, 1991

7/804850

Roger Schlafly - Soquel CA

H04K 100

380 30

A device for applying modular arithmetic exponentiation and reduction to an input message, and method. The device includes a partial array multiplier and an array subtracter, but requires no divider unless the modulus is changed. The intermediate results are only approximate but a correction technique makes the output signal exact.

54716128, Nov 28, 1995

Mar 3, 1994

8/205922

Roger Schlafly - Soquel CA

Borland International, Inc. - Scotts Valley CA

G06F 1730

395600

An electronic spreadsheet system of the present invention includes a Formula Evaluator having a preferred interface and methods for compiling spreadsheet formulas into native machine language for a target processor/coprocessor. Methods are provided for improved cell lookups, whereby a system memory address for a cell record may be compiled directly into the machine language sequence for a compiled formula. Additional methods are provided for simplifying error checking. The methods adapt NaN (IEEE format) values for encoding spreadsheet ERR and NA values, so that the on-chip logic of the coprocessor may be employed for correctly propagating ERR and NA values. Preferred auditing methodology is also described, which includes further modifying the format of NaN values so that a NaN encoding an ERR or NA also embeds the address of the originating cell (i. e. , the first cell which first gave rise to the ERR or NA value).

53735609, Dec 13, 1994

Aug 4, 1993

8/102478

Roger Schlafly - Soquel CA

H04K 100

380 30

A method is given for the modular reduction of cryptographic variables, a component of many public key cryptosystems. It involves calculating a partial inverse to the modulus, partially multiplying cryptovariables, and using estimates which depend on properties of the modulus, If the estimates fail, a spill word is used. A method for choosing a modulus to get cryptographic security and maximal efficiency in modular reduction is also given.

56339984, May 27, 1997

Jul 18, 1995

8/503894

Roger Schlafly - Soquel CA

G06F 1100

395180

An electronic spreadsheet system of the present invention includes a Formula Evaluator having a preferred interface and methods for compiling spreadsheet formulas into native machine language for a target processor/coprocessor. Methods are provided for improved cell lookups, whereby a system memory address for a cell record may be compiled directly into the machine language sequence for a compiled formula. Additional methods are provided for simplifying error checking. The methods adapt NaN (IEEE format) values for encoding spreadsheet ERR and NA values, so that the on-chip logic of the coprocessor may be employed for correctly propagating ERR and NA values. Preferred auditing methodology is also described, which includes further modifying the format of NaN values so that a NaN encoding an ERR or NA also embeds the address of the originating cell (i. e. , the first cell which first gave rise to the ERR or NA value).