Secure Computing Corporation

Karen Heart

Alexander Rasin

Methods, systems, and devices for parsing text are described herein. A method of securing executable files is performed at a computing device having one or more processors and memory. The memory stories one or more programs configured for execution by the one or more processors. The computing device obtains source text that comprises a disassembled executable file and identifies, via a general parser module, the syntax of the source text by performing a recursive descent parsing of the source text. The device generates an abstract syntax tree (AST) for the source text based on the identified syntax and generates a transformed AST from the generated AST by replacing one or more system calls with respective protected system functions. The device also generates a secured executable file by assembling the transformed AST.

Methods and systems for recursive descent parsing

A method prevents unauthorized access to user data files on a computing device. The device receives a request from an application to open a data file (including file name path). The device determines whether the path corresponds to a designated storage location for user data files and determines whether access to the data file has previously been granted for the application. When the file is a user file with no permission for the application, the device uses a volition table to determine whether access volition has been asserted for the data file by the application within a preceding predefined period of time. When access volition has been asserted, the device permits the application to access the data file. When access volition has not been asserted, the device displays a user interface box prompting a user to decide whether or not to grant the application access to the data file.

Operating system enhancements to prevent surreptitious access to user data files

The various implementations described herein include methods and devices for preventing unauthorized access to files and networks. In one aspect, a method includes installing a first application at a computing device, the first application designated as writing to user files. Installing the first application includes: (i) storing application data files for the first application within a first portion of the memory, where files stored in the first portion are designated as read-only for the first application; and (ii) allocating a second portion of the memory for user data files to be used by the first application. The method further includes installing a second application at the computing device, the second application designated as writing to application data files. Installing the second application includes: (i) allocating a third portion of the memory for prototype writable application data files; and (ii) allocating a fourth portion of the memory for network-based data access.

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Forest Park, IL, United States of America

Karen Heart