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The United States of America as Represented by the National Security Agency

The United States of America, as Represented by the Director, National Security Agency

The United States of America as Represented by the Director of the

Patrick W Dowd

Keith B Alexander

John T McHenry

Robert L Grossman

John Thomas Mchenry

A device and method of controlled, multilevel chain of trust/revision by certifying of each user, device, action, and circumstance in the creation, modification, and transmission of computer information, including a revision history of any modification, and identification of any uncertified computer object used.

Device for and method of controlled multilevel chain of trust/revision

A device and method of multilevel chain of trust/revision by certifying each user, device, action, and circumstance in the creation, modification, and transmission of computer information, including a revision history of any modification.

Device for and method of multilevel chain of trust/revision

Electronic network security by establishing a network topology, including multiple devices, where the network includes a command and control layer and a transport layer, where the command and control layer is changeable by the transport layer and vice versa. All phases of an intrusion attempt are monitored to anticipate an intrusion, prevent an intrusion, and remedy a successful intrusion. An assessment of the threat is made in multiple dimensions. The topology of the network may be changed in accordance with the threat assessment. In addition, computer traffic in the network and from the intrusion source may be modified or stopped to guard against an intrusion, prevent an intrusion, and remedy a successful intrusion. The command and control layer is changeable by the transport layer and vice versa.

Device for and method of computer intrusion anticipation, detection, and remediation

The present invention is a device for and method of accessing a network by initializing a database, an approved list, and a disapproved list; receiving an connectionless network packet; computing a flow tag based on the connectionless network packet; discarding the connectionless network packet and returning to the second step if the flow tag is on the disapproved list; allowing access to the network and returning to the second step if the flow tag is on the approved list; comparing the flow tag to the database if the flow tag is not on the approved list or the disapproved list; discarding the connectionless network packet, adding the flow tag to the disapproved list, and returning to the second step if the database rejects the flow tag; and allowing access to the network, adding the flow tag to the approved list, and returning to the second step if the database accepts the flow tag.

Firewall for processing a connectionless network packet

The present invention is a device for and method of accessing an information network by initializing a database, an ATM approved list, an IP approved list, and an IP disapproved list; receiving a datagram; discarding the datagram if it is not on the ATM approved list; determining the datagram's type; allowing access to the network and comparing the connection request, if any, to the database if the datagram is ATM signaling; discarding the datagram if the datagram is ATM signaling and the database denies the request; adding the request to the ATM approved list if the datagram is ATM signaling and the database allows the request; allowing access to the network if the datagram is ATM data that excludes IP data and the request is on the ATM approved list; computing a flow tag if the datagram is ATM data that includes IP data; discarding the datagram if the flow tag is on the IP disapproved list; allowing access to the network if the flow tag is on the IP approved list; comparing the flow tag to the database if the flow tag is neither on the IP approved list nor on the IP disapproved list; discarding the datagram and adding the flow tag to the IP disapproved list if the database rejects the flow tag; and allowing access to the network and adding the flow tag to the corresponding approved list if the database accepts the flow tag; and performing these steps on the next datagram

Firewall for processing connection-oriented and connectionless datagrams over a connection-oriented network

A network firewall security apparatus that enables a very high degree of traffic selectability yet avoids the usual performance penalty associated with firewalls. This approach is specific to high-speed circuit switched networks, Asynchronous Transfer Mode (ATM) networks in particular. Security management is achieved through active connection management with authentication, better suited to the cell-based environment of high-speed circuit switched networks and to the mix of circuit switched traffic, where Internet Protocol (IP) datagrams comprise a fraction of the total traffic. The information in the signaling cells is used to determine which flows, rather than which individual cells, are allowed to pass through the firewall. A hierarchical method has been devised, in which the physical location of the interrelated components may be decoupled. Active connection management is applied in determining the approval of a connection based on signaling information and network state information. Once a flow has been validated, the cells associated with that flow are allowed to proceed through the firewall at line-speed with limited intervention and no performance degradation.

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Columbia, MD, United States of America

Patrick W Dowd