Ideal Thumbnail-Preserving Encryption for Balancing Image Privacy and Usability

In this dissertation, we propose Ideal Thumbnail-Preserving Encryption (Ideal TPE), as a special case of format-preserving encryption, to balance image privacy and usability concerns in a cloud environment. We first introduce a concrete construction for Ideal TPE, that provably leaks nothing about the plaintext (unencrypted) image beyond its thumbnail. We then furnish a formal security analysis for the construction that yields asymptotic security. To demonstrate compatibility with existing photo storage services, we provide a prototype implementation. Furthermore, we study the usability impact of TPE encrypted images through a user study. We show that the ability of image owners to interact with TPE encrypted image thumbnails is not significantly reduced compared to the interactions with high-resolution images. Finally, we take into account the threat of low-resolution face-recognition against TPE, and propose adding a reversible face sanitization pre-processing step. We argue that this face sanitization approach can thwart low-resolution face recognition in a systematic way without compromising reversibility. We qualitatively show that sanitized TPE image thumbnails look visually similar to those of unsanitized TPE images, and hence are expected to offer similar usability. Our findings indicate that TPE and its enhanced version with face sanitization are promising approaches for balancing usability and privacy concerns for image storage in the cloud

Aeronautical engineering: A continuing bibliography with indexes (supplement 254)

This bibliography lists 538 reports, articles, and other documents introduced into the NASA scientific and technical information system in June 1990. Subject coverage includes: design, construction and testing of aircraft and aircraft engines; aircraft components, equipment and systems; ground support systems; and theoretical and applied aspects of aerodynamics and general fluid dynamics

SPATIAL TRANSFORMATION PATTERN DUE TO COMMERCIAL ACTIVITY IN KAMPONG HOUSE

ABSTRACT Kampung houses are houses in kampung area of the city. Kampung House oftenly transformed into others use as urban dynamics. One of the transfomation is related to the commercial activities addition by the house owner. It make house with full private space become into mixused house with more public spaces or completely changed into full public commercial building. This study investigate the spatial transformation pattern of the kampung houses due to their commercial activities addition. Site observations, interviews and questionnaires were performed to study the spatial transformation. This study found that in kampung houses, the spatial transformation pattern was depend on type of commercial activities and owner perceptions, and there are several steps of the spatial transformation related the commercial activity addition. Keywords: spatial transformation pattern; commercial activity; owner perception, kampung house; adaptabilit