58 results about "Multilevel security" patented technology

Techniques are disclosed for improving multi-level security (“MLS”) in computing systems. Communication between MLS systems in the prior art requires explicitly tagging each packet with its security classification. The packet tags comprise variable-length bit patterns inserted into packet headers. This results in a number of drawbacks, including increased path length and code complexity, as well as reduced interoperability. An MLS system according to the present invention simulates a cluster or collection of single-level security systems, and thereby avoids packet tagging. For each security classification used by an MLS system, a distinct source address is defined. This source address is used for outbound packets having that security classification, such that the packet's source address implicitly identifies the packet's security classification.

A Multilevel Security (MLS) server provides MLS functionality to single-level applications running on a remote Multiple Independent Level Security (MILS) or MLS client device. More specifically, the MLS server provides a plurality of different security domains in which applications can execute. The client device executes a single-level application in a first security domain, the single-level application not natively capable of communicating with other domains. The single-level application in the first security domain sends a request to the MLS server. The MLS server receives the request, passing it to all applicable domains, including a second security domain, where it is duly executed. The MLS server then provides the results of the request execution—if any—back to an appropriate application on the client device. For example, the single-level application in the first security domain can display the aggregated results obtained from multiple distinct security domains, or an application running in the second security domain can display the results.

Techniques for authentication are provided. A first authentication request transformed with a private portion of a first type split private key is received. A first user is authenticated for a first level of network access based upon the first request being transformed with the first type of split private key. A second authentication request that is transformed with a private portion of a second type private key is also received. A second user is authenticated for a second level of network access based upon the second request being transformed with the second type of split private key.

A data integrity verification method and system based on a root random number to ensure secure distributed data storage on a public cloud. A new root random number can be generated in response to receiving a file for storage to the public cloud. A unique random number tag for each data chunk associated with the file can be calculated via a shift operation and the tag can be added to the data chunk. A hash function (message digests) can be then generated and concatenated with the data chunk and the random number tag. The data chunk in conjunction with the hash and the random number tag can be encrypted by an encryption module and stored to the public cloud in order to provide multiple levels of security with respect to the distributed public cloud storage. Upon file retrieval, the encryption module decrypts all data chunks and recalculates the hash in order to verify the data integrity of the file.

A method, system and computer program for providing multilevel security to a computer network. The method comprises the step of receiving a first communication packet on at least one network interface port from an outside network. The method further includes the steps of filtering the first packet in one of at least two levels of security comprising a first level of security which examines the content information of the packet and a second level of security which examines the first packet excluding the content information of the packet. The system includes a first packet filter configured to filter its input packets by examining content information of its packets and a second packet filter configured to filter its input packets by examining the header information without examining the content information of its packets. The system further includes a third filter which is configured to forward a number of packets to one of the first and second filters, thereby providing security to the computer network. The computer program includes a first module located in an application layer, a second module located in a network layer, and a third module located in a kernel space and configured to examine a number of packets received by the computer network from at least one outside network and to forward the number of packets to one of the first and second modules after examining the number of packets.