摘要:
A system is disclosed for assuring the integrity of file segments. A first server has an associated file repository storing a plurality of files and transfers a file segment on an output upon request. A second server also has an associated file repository and receives and stores the file segment in the associated file repository. The second server identifies if there are additional segments of the same file in the associated file repository and processes the received file segment together with the additional identified file segments to identify the presence of malware. Finally, the second server transfers the received file segment on an output as a scanned file segment only if no malware is identified. A third server has an associated file repository and is configured to receive and store the scanned file segments in the associated file repository and to transfer a received scanned file segment to a client.
摘要:
A system for printing includes one or more printers, a send platform, a print spooling platform coupled to the one or more printers, and a one-way data link enforcing unidirectional data transfer from the send platform to the print spooling platform, wherein the send platform is configured to receive a print job, convert the print job into a print file in a printable format for the one or more printers, and send the print file to the print spooling platform across the one-way data link, and the print spooling platform is configured to receive the print file from the one-way data link, control spooling of the print file for the one or more printers, and send the print file to the one or more printers, and wherein the one or more printers cannot communicate to the send platform.
摘要:
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.
摘要:
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.
摘要:
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.
摘要:
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.
摘要:
A communications device for ensuring secure data transfer provided having an interface device for controlling data transfer, an integrated circuit coupled to the interface device and having a processor, a non-volatile memory for storing at least program code for the processor, a volatile memory, an input pin and an output pin; and an electrical conductor which electrically connects the input pin and the output pin. The electrical conductor passes through an external portion of the enclosure, e.g., a slot, which allows a user to easily sever the electrical conductor. In operation, a portion of the program code detects when the electrical conductor is severed and causes the program code in the non-volatile memory to be erased, data transfer via the interface device to be disabled, and power to the integrated circuit cut off to ensure that all information in volatile memory is erased.
摘要:
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.
摘要:
A method and system for testing a file (or packet) formed from a sequential series of information units, each information unit within a predetermined set of information units, e.g., each information unit may correspond to a character within the ASCII character set. An information unit-pair entropy density measurement is calculated for the received file using a probability matrix. The probability matrix tabulates the probabilities of occurrence for each possible sequential pair of information units of the predetermined set of information units. The computed information unit-pair entropy density measurement is compared with a threshold associated with an expected file type to determine whether the received file is of the expected file type or of an unexpected file type. The probability matrix may optionally be generated from the received file prior to calculating the density thereof. The probability matrix may optionally be predetermined based on the expected file type.
摘要:
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. Hence, it enables secure bilateral communications across different network security domains.