Abstract: A malware detection system comprising a signature generator for combining malware signatures into a malware signature filter with a fixed false positive rate; a central location configured to send the malware signature filter to each of a plurality of hosts that are configured to scan files on the host system using the malware signature filter; each host configured such that if the scan indicates a positive result, the file is quarantined and the host sends identification back to central location if a false positive result is obtained for additional instruction. A method for malware detection operative to combine malware signatures into a filter with fixed false positive rate; comprising sending a malware signature filter to hosts for scanning of files on the host system and incoming data; if the malware signature filter returns a positive alert, identification is sent back to a central location.

Abstract: A semi-fragile image tamper detection system and method based on thumbnail hiding and which signifies the image areas in which tampering has occurred, is provided. A thumbnail is defined as a low-resolution version of an entire image or the significant features of an entire image. Thumbnail hiding is chosen to be resilient to effects of both image compression and low levels of transmission channel noise. The thumbnail computation and embedding techniques are chosen such that the resultant marked image corresponds in size and dynamic range to the original image.

Abstract: A semi-fragile image tamper detection system and method based on thumbnail hiding and which signifies the image areas in which tampering has occurred, is provided. A thumbnail is defined as a low-resolution version of an entire image or the significant features of an entire image. Thumbnail hiding is chosen to be resilient to effects of both image compression and low levels of transmission channel noise. The thumbnail computation and embedding techniques are chosen such that the resultant marked image corresponds in size and dynamic range to the original image.

Abstract: The Spread Spectrum Image Steganography (SSIS) of the present invention is a data hiding/secret communication steganographic system which uses digital imagery as a cover signal. SSIS provides the ability to hide a significant quantity of information bits within digital images while avoiding detection by an observer. The message is recovered with low error probability due the use of error control coding. SSIS payload is, at a minimum, an order of magnitude greater than of existing watermarking methods. Furthermore, the original image is not needed to extract the hidden information. The proposed recipient need only possess a key in order to reveal the secret message. The very existence of the hidden information is virtually undetectable by human or computer analysis. Finally, SSIS provides resiliency to transmission noise, like that found in a wireless environment and low levels of compression.