Patent application number | Description | Published |
20080278217 | PROTECTION FOR CIRCUIT BOARDS - A system comprising a circuit board and an integrated circuit device mounted on the circuit board by means of an external contact, and comprising an anti-tamper device being connectable to the external contact to switch the integrated circuit device into a safe mode upon application of a predetermined electrical state at the external contact is described. | 11-13-2008 |
20110093714 | SYSTEMS AND METHODS FOR ASYMMETRIC CRYPTOGRAPHIC ACCESSORY AUTHENTICATION - Embodiments relate to systems, methods and devices for asymmetric cryptographic authentication. In an embodiment, a system includes an accessory comprising an authentication chip, the authentication chip comprising a public authentication key, a private authentication key and data signed by a private verification key; and a device comprising a public verification key forming a verification key pair with the private verification key, the device configured to read the data and public authentication key from the authentication chip, verify the data and the public authentication key using the public verification key, and authenticate the accessory for use with the device using the public authentication key if verified. | 04-21-2011 |
20110154043 | SYSTEMS AND METHODS FOR CRYPTOGRAPHICALLY ENHANCED AUTOMATIC BLACKLIST MANAGEMENT AND ENFORCEMENT - Embodiments relate to systems and methods for the management and enforcement of blacklists of counterfeited, cloned or otherwise unauthenticated devices. In an embodiment, a system comprises an accessory comprising an authentication chip including data signed by a private verification key, the data including a unique identifier related to the accessory, and a device comprising a public verification key forming a verification key pair with the private verification key and an identifier list, the device configured to read the data from the authentication chip, compare the unique identifier with the identifier list, and reject the accessory if the unique identifier is found in the identifier list. | 06-23-2011 |
20120213361 | SYSTEMS AND METHODS FOR DEVICE AND DATA AUTHENTICATION - Embodiments relate to systems and methods for authenticating devices and securing data. In embodiments, a session key for securing data between two devices can be derived as a byproduct of a challenge-response protocol for authenticating one or both of the devices. | 08-23-2012 |
20140129837 | SYSTEMS AND METHODS FOR DEVICE AND DATA AUTHENTICATION - Embodiments relate to systems and methods for authenticating devices and securing data. In embodiments, a session key for securing data between two devices can be derived as a byproduct of a challenge-response protocol for authenticating one or both of the devices. | 05-08-2014 |
20140129840 | SYSTEMS AND METHODS FOR DEVICE AND DATA AUTHENTICATION - Embodiments relate to systems and methods for authenticating devices and securing data. In embodiments, a session key for securing data between two devices can be derived as a byproduct of a challenge-response protocol for authenticating one or both of the devices. | 05-08-2014 |
Patent application number | Description | Published |
20080252296 | Multiple Frequency Based Leakage Correction for Imaging in Oil Based Muds - Oil-based mud imaging systems and methods having leakage current compensation. In some embodiments, disclosed logging systems include a logging tool in communication with surface computing facilities. The logging tool is provided with a sensor array having at least two voltage electrodes positioned between at least two current electrodes that create an electric field in a borehole wall, and is further provided with electronics coupled to the current electrodes to determine a differential voltage between the voltage electrodes in response to different current frequencies from the current electrodes. From the voltage measurements at different frequencies, the computing facilities determine borehole wall resistivity as a function of depth and azimuth, and may display the resistivity as a borehole wall image. | 10-16-2008 |
20080272789 | Permittivity Measurements With Oil-Based Mud Imaging Tool - Oil-based mud imaging systems and methods that measure formation permittivity. In some embodiments, disclosed logging systems include a logging tool in communication with surface computing facilities. The logging tool is provided with a sensor array having at least two voltage electrodes positioned between at least two current electrodes that create an electric field in a borehole wall, and is further provided with electronics coupled to the voltage electrodes to determine a differential voltage magnitude and phase. From the magnitude and phase, formation resistivity and permittivity measurements can be determined and used to construct a borehole wall image. | 11-06-2008 |
20100231225 | Oil Based Mud Imaging Tool with Common Mode Voltage Compensation - An apparatus and method for minimizing the effects of a common mode voltage signal in downhole logging tools utilized to determine the resistivity of an adjacent portion of a borehole wall. Two current electrodes are energized by an excitation source to create an oscillatory electric field in a borehole wall. A voltage drop across a segment of the borehole wall is measured by two voltage electrodes, and the differential voltage is used in combination with a measured current flow to determine a resistivity value for the borehole wall. A common mode voltage in front of the two voltage electrodes is measured and minimized by controlling the excitation source, thereby reducing the resistivity measurement error. | 09-16-2010 |