32results about How to "Protect against malicious attacks" patented technology

The invention discloses a portable security computer system based on encrypted hash tag protection. The portable security computer implements security isolation from the Internet based on a data block encrypted hash tag protection mechanism, and adopts a secure TFTP protocol to realize communication with mobile intelligence. The secure exchange of confidential files between terminals implements a single device function restriction on the USB HID interface to prevent attacks from the interface. The present invention adopts data block encryption hash tag protection mechanism, secure transmission protocol control mechanism and USB HID interface single device function restriction mechanism, etc. These security mechanisms together provide strict security isolation protection for the operating environment of the portable computer, which can not only provide All processing links involving sensitive files provide a secure computing environment that is also resistant to various possible malicious attacks.

The invention discloses a perceptual hashing-based practical and safe image forensic system and a perceptual hashing-based practical and safe image forensic method. The system comprises a certificate authority (CA), forensics computing platform (FCP) and a forensic center (FC). The method comprises the following steps that: the CA provides a certificate for a user, the FCP and the FC and distributes and manages a control key of a hash function for the FCP and the FC; the FCP calculates a characteristic value and generates a hash value of an image at a registration or forensics stage; the FC manages an image hash value from the FCP and provides retrieval and forensics services; the user submits the image to the FCP, extracts an image retrieval characteristic by using the FCP, calculates the hash value of an image segment by using a key distributed by the CA and submits the hash value to an FC database; and when the user needs an authentication image, the image is also submitted to the FCP, the retrieval characteristic is extracted to retrieve the most coincident original image from the FC, the image is segmented and the hash value is calculated by using the same key and the difference between the image and the hash value is compared so as to determine a position on which content tampering occurs. The system achieves high balanced performance in the aspects of safety, robustness, sensibility, rapid retrieval and the like.