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1 result tagged letterlocking  ✕   ✕
Letterlocking http://letterlocking.org/about/
Tue 13 Nov 2018 04:18:18 PM PST archive.org

A site that documents the practice of letterlocking - cleverly folding, cutting, and sealing letters in the 17th century for tamper evidence and security.

academia opsec letterlocking writing security privacy history
5001 links, including 376 private
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