На шее Трампа заметили странное пятно во время выступления в Белом доме23:05
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Back in the 1980s, a cryptographer named David Chaum caught a glimpse of our soon-to-be future, and he didn’t much like it. Long before the web or smartphones existed, Chaum recognized that users would need to routinely present (electronic) credentials to live their daily lives. He also saw that this would have enormous negative privacy implications. To address life in that world, he proposed a new idea: the anonymous credential.，这一点在夫子中也有详细论述
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