Cyfeiria rhwydwaith goriad-cyhoeddus (Saesneg : PKI - public key infrastructure) at gasgliad o galedwedd, meddalwedd, pobl, polisiau, a dulliau gweithredu, sy'n anghenrheidiol i greu, rheoli, dosbarthu, defnyddio, storio, ac i ddirymu tystysgrifau digidol.
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