National Security Agency

About: National Security Agency is a government organization based out in Fort George Meade, Maryland, United States. It is known for research contribution in the topics: Signal & Encryption. The organization has 393 authors who have published 485 publications receiving 15916 citations. The organization is also known as: NSA & N.S.A..

Formal Groups, Elliptic Curves, and Some Theorems of Couveignes

Abstract: The formal group law of an elliptic curve has seen recent applications to computational algebraic geometry in the work of Couveignes to compute the order of an elliptic curve over finite fields of small characteristic ([2], [6]). The purpose of this paper is to explain in an elementary way how to associate a formal group law to an elliptic curve and to expand on some theorems of Couveignes. In addition, the paper serves as background for [1]. We treat curves defined over arbitrary fields, including fields of characteristic two or three. The author wishes to thank Al Laing for a careful reading of an earlier version of the manuscript and for many useful suggestions.

Port connector securement device

Abstract: The present invention is a port connector securement device comprising a resting piece, a planar surface, and at least one projection extending from the bottom of the planar surface where the at least one projection rests within at least one slot of an USB port when the port connector securement device is slideably insertable, along with the USB cable into the USB port to ensure that the USB cable cannot be removed upon the port connector securement device insertion into the USB port

Sample-stage for scanning electron microscope

Abstract: The present invention is a sample-stage for a scanning electron microscope. The sample-stage has a base and a horizontal support member, where there is an aperture in the horizontal support member. A vertical support member abuts the base on one end and the horizontal support member on the other end so that the vertical support member is under, and at an angle to, the aperture in the horizontal support member. A collimator, having an aperture in alignment with the aperture in the horizontal support member, abuts the top of the horizontal support member. A first reflector abuts the surface of the vertical support member under the aperture in the horizontal support. A second reflector abuts a portion of the top surface of the base that is not covered by the vertical support member.

Method of modeling single data class from multi-class data

Abstract: The present invention is a method of modeling a single class of data from data containing multiple classes of data of the same type of data by first receiving a collection of data that includes data from multiple classes of data of the same type where the amount of data of the single class of data exceeds that of any other class of data. A first statistical model of the received collection of data is generated. The collection of data is divided into subsets. Each subset of the speech collection of data is scored using the first statistical model. A set of scores is selected. The subsets corresponding to the selected scores are identified. The identified subsets are combined. A second statistical model of the type of the first statistical model is generated for the combined subsets and used as the model of the single class of data.

Majority logic circuit

Abstract: A novel majority logic circuit is disclosed to determine whether the majority of the inputs are a one, within a constant number of clock cycles, regardless of the number of inputs. The majority logic circuit according to the present invention includes a plurality of current mirror stages and an amplifier stage. For each input, one current mirror stage is used, which outputs either a current source if the input is a one, or a current sink if the input is a zero. The current sources of all the input current mirror stages are connected in parallel to the current source input node of the amplifier stage. The current sinks of all the input current mirror stages are connected in parallel to the current sink input node of the amplifier stage. The amplifier is a differential type, which outputs either a positive voltage or a zero voltage depending upon the majority of the inputs.