public-key

noun, often attributive
pub·​lic-key | \ˈpə-blik-ˈkē \

Definition of public-key 

: a cryptographic element that is the publicly shared half of an encryption code and that can be used only to encode messages

First Known Use of public-key

1976, in the meaning defined above

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The first known use of public-key was in 1976

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