[Cryptography] "Letterlocking"

Thu Jul 18 13:26:18 EDT 2019

Fascinating story about physical security of communication in the
pre-industrial world.

https://www.atlasobscura.com/articles/what-did-people-do-before-envelopes-letterlocking?utm_source=Atlas+Obscura+Daily+Newsletter&utm_campaign=7f707c590c-EMAIL_CAMPAIGN_2019_07_18_Not_NYC&utm_medium=email&utm_term=0_f36db9c480-7f707c590c-63217145&ct=t(EMAIL_CAMPAIGN_07_18_2019_Not_NYC)&mc_cid=7f707c590c&mc_eid=8437a3c9e4

-- 
Jim Windle
(646) 470-9657
Oh, and be sure to state your name so my cyborg can tell me who is calling!
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