In this study, we designed and evaluated the Se-cure Optical Transport Network (SOTN) architecture, which is expected to be the mainstream of communications between datacenters in the future. We evaluated the security using for-mal verification and proposed countermeasures against possible adversary models. For the architecture design and evaluation, we referred to IPsec, which is the de-facto standard protocol for communication between datacenters. For the security evaluation, we used ProVerif, which is the de-facto standard of formal veri-fication tools for cryptographic protocols. This study shows that an unknown attack (called the Key Compromised Disagreement (KCD) attack) is detected in the assumed adversary models and that the proposed countermeasures can reduce the impact of the KCD attack. The results suggest that unknown attacks can occur even for individually secure devices depending on their combinational and architectural designs and that the security of the entire architecture can be improved by applying an enhanced authentication mechanism to a specific communication channel.

Accuracy of digital elevation model (DEM) obtained by the Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER) that has along-track stereovision is investigated. The pointing offset and stability of the radiometer is one cause of the geometric deviation of the ASTER DEM attached with orthorectified image. The correction methodology to be implemented to the data processing is suggested. A fine-tuning of image matching procedure leads to better reproduction of the topography. The comparison with reference DEM is described.

In this study, we demonstrate an automatic methodology for estimating the satellite pitch vibration by using information of sensors with small parallax and correcting the images taken by the sensors themselves. Consequently, We can get corrected digital elevation model (DEM) from the images disturbed by satellite pitch vibration. A satellite often vibrates in roll and pitch directions, and each component has a bad influence on photogrammetry. Since the pitch component directly deteriorates the accuracy of DEM in case of along-track stereo sensor, we focus on estimating and correcting pitch vibration. Our methodology is particularly useful for small parallax stereo system, because sub-pixel image matching precision is needed for small parallax stereo system and satellite vibration causes a critical problem.