(cryptography) public key

encryption

encrypt

message / statement / speech

to use / to employ / to make use of, to apply / to spend

to open to the public, to release, to put on exhibit / to disclose, to expose

opening, release, exhibition / disclosure, exposure

(cryptography) code; cipher

he / distal demonstrative, something far off removed from both speaker and listener: that / boyfriend

distal demonstrative, something far off removed from both speaker and listener: that, yon / particularly, male personal third person pronoun: he / by extension from he: boyfriend