The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 02, 1999
Filed:
Jul. 18, 1997
Bruce Schneier, Minneapolis, MN (US);
John M Kelsey, Jefferson City, MO (US);
Counterpane Internet Security, Inc., Minneapolis, MN (US);
Abstract
In many computer applications, sensitive information must be kept on an untrusted machine. Such information must be protected against attackers, as well as against partially trusted entities to be given partial, but not total, access to the stored information. This invention provides a method, apparatus and computer-readable data structure for inhibiting an attacker from accessing or corrupting information stored by an untrusted machine. More specifically, in a log file generated during a process in which the untrusted machine is in limited communication with a trusted machine, entries generated prior to the attack remain secure (they cannot be modified without detection), even though subsequent entries can not be trusted. One embodiment of the invention also allows a partially trusted verifier to read and verify entries in the log file, but not to change them without detection. In another embodiment of the invention, operating with or without the trusted machine, the untrusted machine's log file can also incorporate log files of other processes.