Way back when, before email, RSA keys, and 128-bit AES encryption, people had a pretty clever way of making sure that their mail was delivered unread. As you’ve seen in hundreds of movies, wax was poured onto a piece of parchment (or vellum, or whatever people were writing on) and while still hot the wax [...]
Source: http://www.geek.com/articles/gadgets/top-secret-usb-stick-uses-wax-seal-for-verification-20120430/
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