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[wlug] The Fine And Ancient Art Of Letterlocking

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Lawrence D'Oliveiro ldo@g...
Fri Mar 8 09:46:44 NZDT 2019

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

And yes, there is a whole website devoted to this:

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