Compare symmetric and asymmetric encryption schemes, and discussthe circumstances under which a distributed system would use one orthe other.
Preservation and a Sense of Orientation for American Cities by Robin Elisabeth Datel ♣ "In pursuit of goals stability, identity, and environmental control, current preservationists follow four imperative: to retain diverse elements of the past, to perpetuate the distinctive identities of places, to involve amateurs in landscape care, and to practice a conservative approach to environmental change." ♣ "Traditionally, age and rarity have been important factors in decisions about preserving landscape elements" ♣ "In general, the older an area, the more likely it is to have been designated for preservation. ♣ For ex: Neighborhoods in San Francisco and Oakland with Victorian houses are widely appreciated for their architectural distinctiveness and charm, but most remain without preservation
