Abstract: A cross-domain system for transferring files from a client to a server. A first server in the first network domain receives and stores files from the client via the first network. The received files are processed based on predetermined instructions stored in an associated file. The processed received files are transmitted to a second server via a one-way data link. The second server in the second network domain receives and stores the processed received files. The received files are further processed based on predetermined instructions stored in an associated file. The further processed received files are transmitted to the server via the second network. The two associated files are stored in permanent memory with security policies which prevent the files from disrupting operation of the first and second servers, respectively. The security policies allow the associated files to be overwritten to update the processing performed by the associated server.

Abstract: A system for bilaterally transferring information between a client and an NFS server. The client is coupled with an NFS server proxy running on a second receive server via a first network and communicates thereon. The processed first information is passed to a first send server via a dedicated network connection. The first send server causes the first information to be transmitted to the NFS server, via a first one-way data link, a first receive server, a second dedicated network connection and an NFS client proxy running on a second send server. The NFS server is coupled to the NFS client proxy via a second network. The NFS client proxy forwards information received from the NFS server to the client via a second one-way link, the NFS server proxy running on the second receive server and the first network.

Abstract: A system for providing a secure video display using a one-way data link. An input interface for receives a video stream signal. The one-way data link has an input node coupled to receive the input video stream signal and an output node. A processing system is coupled to the output node of the one-way data link and is configured to run a predetermined operating system. In an embodiment, a video display software program operates within the predetermined operating system to process the video stream signal received from the output node of the one-way data link and to provide an output signal for viewing on a display coupled to the processing system. Optionally, the video display program operates within a virtual operating system running within the predetermined operating system. In other embodiments, the video display program may process a video stream signal containing a plurality of different video programs.

Abstract: A one-way interface for a network device which secures status registers therein from unauthorized changes. The interface includes a first server, a one-way data link and a second server. The first server is coupled to the status registers to read information stored therein. The first server reads the information from the status registers and transmits the information on an output. The one-way data link has an input coupled to the output of the first server and an output. The second server has an input coupled to the output of the one-way data link and an output coupled to a network. The second server receives the information from the first server via the one-way data link. The second server transmits the information on the output to a predetermined network destination and/or provides a user interface for providing access to the information via the network.

Abstract: A bilateral data transfer system comprising a first node, a second node, a first one-way link for unidirectional transfer of first data from the first node to the second node, and a second one-way link for unidirectional transfer of second data from the second node to the first node, wherein the unidirectional transfer of the first data across the first one-way link and the unidirectional transfer of the second data across the second one-way link are independently administered by the bilateral data transfer system. Under such bilateral data transfer system, each of the one-way data links may be subject to separately administered security restrictions and data filtering processes, enabling secure bilateral communications across different network security domains.

Abstract: A system for securely transferring commands to a recipient device. An access interface allows a user to enter a command for the recipient device. The access interface only allows the user to enter commands within a subset of commands associated with a role assigned to the user. The control interface receives information, i.e., the command entered by the user and the associated user role, from the access interface. The control interface outputs, to the manifest engine, the information and a manifest table which identifies each role and the subset of commands associated with each role. The manifest engine compares the information with the contents of the received manifest table, and, if the command entered by the user corresponds to a command within the set of commands associated with the role assigned to the user, forwards the command to the recipient device.

Abstract: A secure front-end interface for a PLC, RTU or similar device is disclosed. A first server is coupled to the PLC via a communications link and is configured to receive status information from the device and transmit the information to a second server via a one-way data link. The second server has a network interface for coupling to a network and receives the information from the first server via the one-way data link and outputs the information via the network interface based upon a user request. The front-end interface may further include a second one-way data link coupled from the second server to the first server to allow user command entry. The secure front-end interface may alternatively consist only of a single server coupled between the device and the network which requires a user to enter a password before obtaining access to the status information.

Abstract: A system for monitoring the status of one or more networks and/or of devices coupled to each of the one or more networks. Status monitoring applications are associated with the networks and/or devices. The status monitoring applications output a respective status log file containing information about the system status of the associated network or device. In one embodiment, the system status is derived from the Windows Event Log. The status monitoring applications are coupled to a remote receive module via a one-way data link or a firewall. The remote receive module receives the log files and processes the log files to either identify any unauthorized status conditions identified therein or to generate a cumulative log file consisting of events occurring over a predetermined time interval.

Abstract: A system is disclosed for monitoring a channel passing information which includes an identifying designation. A channel monitor is coupled to the channel and configured to provide on an output all information passing on the channel. A manifest engine is coupled to the channel monitor to receive the information passing on the channel and to an operator console to receive an information manifest table. The information manifest table contains at least one identifying designation. The manifest engine compares the information received with the information in the information manifest table and only provides on the output that information having an identifying designation that matches an identifying designation included within the information manifest table. A storage server is coupled to the manifest engine and configured to receive and store the information provided from the manifest engine.

Abstract: A system is disclosed that provides an authenticated payload, e.g., a software program or update, to a recipient device. A storage device stores a payload. A provider server coupled to the storage device outputs the payload and a manifest table. The manifest table includes information identifying the payload. A manifest engine TX server receives the payload and the manifest table from the provider server, generates information about the received payload, compares the information generated about the payload with the contents of the received manifest table, and, if the information about the received payload matches information for a particular one of the at least one payloads included in the received manifest table, forwards the payload to a one-way data link. The output of the one-way data link is coupled to a manifest engine RX server, which in turn forwards any received payload to a recipient device coupled to an output of the manifest engine RX server.

Abstract: A system is disclosed that provides an authenticated payload, e.g., a software program or update, to a recipient device. A storage device stores a payload. A provider server coupled to the storage device outputs the payload and a manifest table. The manifest table includes information identifying the payload. A manifest engine TX server receives the payload and the manifest table from the provider server, generates information about the received payload, compares the information generated about the payload with the contents of the received manifest table, and, if the information about the received payload matches information for a particular one of the at least one payloads included in the received manifest table, forwards the payload to a one-way data link. The output of the one-way data link is coupled to a manifest engine RX server, which in turn forwards any received payload to a recipient device coupled to an output of the manifest engine RX server.

Abstract: A system for securely transferring information from an industrial control system network, including, within the secure domain, one or more remote terminal units coupled by a first network, one or more client computers coupled by a second network, and a send server coupled to the first and second networks. The send server acts as a proxy for communications between the client computers and the remote terminals and transmits first information from such communications on an output. The send server also transmits a poll request to a remote terminal unit via the first network and transmits second information received in response to the poll on the output. The system also includes, outside the secure domain, a receive server having an input coupled to the output of the send server via a one-way data link. The receive server receives and stores the first and second information provided via the input.

Abstract: A system for providing a secure video display using a one-way data link. An input interface for receives a video stream signal. The one-way data link has an input node coupled to receive the input video stream signal and an output node. A processing system is coupled to the output node of the one-way data link and is configured to run a predetermined operating system. In an embodiment, a video display software program operates within the predetermined operating system to process the video stream signal received from the output node of the one-way data link and to provide an output signal for viewing on a display coupled to the processing system. Optionally, the video display program operates within a virtual operating system running within the predetermined operating system. In other embodiments, the video display program may process a video stream signal containing a plurality of different video programs.

Abstract: A system for filtering a digital signal transmitted in a protocol featuring multi-level packetization from a first server to a second server. The first server is coupled to the second server via a one-way data link. The system includes a filter having an input for receiving the digital signal and an output. The filter is configured to analyze the digital video signal and determine whether the digital signal violates one or more predetermined criteria. The filter may be within the first server, or alternatively, within the second server. The predetermined criteria may be unauthorized security level information included within metadata transmitted with the digital video signal. The predetermined criteria may also be format information that, when not conformed to, indicates potential malware or other bad content included within the digital video signal. The filter provides low data transfer latency and/or decoupling of data filter latency from data transfer latency.

Abstract: An apparatus for relaying a hashed message from a first node to a second node, comprising an inlet interface for receiving a message from the first node, a hash number calculator for hashing the message from the inlet interface, an outlet interface for sending the hashed message to the second node, a first one-way data link for unidirectional transfer from the inlet interface to the hash number calculator, and a second one-way data link for unidirectional transfer from the hash number calculator to the outlet interface, is provided. The apparatus provides a secure mechanism and communication channel for relaying hashed acknowledgment messages from a receive node to a send node to inform the status of data transfer from the send node to the receive node across a one-way data link. The apparatus may be further implemented with the capability of comparing hashed messages from the two nodes.

Abstract: A data transfer system comprising a first node, a second node, and a first one-way link for unidirectional transfer of data from the first node to the second node. The first node is configured to receive data and to allow transfer of the data to the second node via the first one-way link only if there is a match between a characteristic of the received data and an entry in a first predefined configuration file. The system may also include a second one-way link for unidirectional transfer of second data from the second node to the first node. The second node is configured to receive the second data and to allow transfer of the second data to the first node via the second one-way link only if there is a match between a characteristic of the second data and an entry in a predefined configuration file.

Abstract: A system for virtual screen view service, comprising a monitored computer platform, a monitoring computer platform, a server installed on the monitored computer platform, a client installed on the monitoring computer platform, and a one-way data link for unidirectional data transfer from the server to the client, wherein the server is configured to periodically collect screen image data from the monitored computer platform and send it to the client via the one-way data link, and the client is configured to process the image data received from the server via the one-way data link and cause it to be displayed on the monitoring computer platform. An alternative configuration is also disclosed for allowing a remote client to securely monitor the screen of a locally monitored computer platform via an intermediary server.

Abstract: A manifest transfer engine for a one-way file transfer system is disclosed. The manifest transfer engine comprises a send side, a receive side, and a one-way data link enforcing unidirectional data flow from the send side to the receive side. The send side receives and stores a file manifest table from an administrator server. The send side also receives a file from a user and compares it with the file manifest table. Transfer of the file to the receive side via the one-way data link is allowed only when there is a match between the file and the file manifest table. In an alternative embodiment, the receive side instead receives and stores the file manifest table from the administrator server and compares it with the file received from the send side via the one-way data link to determine whether to allow transfer of the file.

Abstract: A data transfer application for concurrent transfer of data streams based on two or more transport layer protocols via a single one-way data link. The present invention provides a great degree of routing flexibility by providing seamless network connectivity under a plurality of transport layer protocols, such as TCP and UDP, between multiple source and destination platforms over a single one-way data link.

Abstract: A method and system for monitoring data transfers over a one-way data link from a send node to a receive node. A send log file monitoring and transmitting module associated with the send node on a first server outputs a send log file containing information about data sent by the send node. A receive log file monitoring and transmitting module associated with the receive node on a second server outputs a receive log file containing information about data received by the receive node. A reconciliation module on a third server receives the send log file and the receive log file and identifies any data transfer errors by comparing the send log file with the receive log file. A web server is coupled to the reconciliation module to provide user access to the identified data transfer errors.