London CNN — A graffiti wall in London’s bustling street art hub of Brick Lane has become an unlikely canvas for protest messages against China’s authoritarian rule, after it was whitewashed and painted over with propaganda slogans promoting Chinese Communist Party ideology. The bright red slogans, spray-painted by a group of young Chinese artists over the weekend, consisted of 24 large Chinese characters outlining the country’s “core socialist values.” The 12 values include “prosperity,” “harmony” and “patriotism,” as well as concepts like “democracy,” “freedom,” “equality,” “justice” and “rule of law” – liberal philosophies familiar in the West, but their meaning…