The Fine And Ancient Art Of Letterlocking

Lawrence D'Oliveiro <[email protected]>
Newsgroups gmane.org.user-groups.linux.waikato
Organization Geek Central
Message-ID <[email protected]> 
Came across this linked from computer security expert Bruce Schneier’s
blog: how did people in pre-industrial times protect paper letters from
prying eyes? There were no mass-produced envelopes in those days, so
they resorted to “letterlocking” -- intricate ways of folding and
sealing a letter to form its own envelope
<https://www.atlasobscura.com/articles/what-did-people-do-before-envelopes-letterlocking>.

And yes, there is a whole website devoted to this:
<http://letterlocking.org/>.
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