I find acerto meaning hit, but in this case does acerto mean to get a copy of keys, reprogramming keys, or anything else?
Check meaning 4. from Aulete:
4. Mec. Regulagem de máquina, motor etc., para que funcione perfeitamente.
Acerto could indeed be a form of the verb acertar (indicative, present, first person, singular), but not here. In that case, it would be pronounced with an open e, rather than the closed one of the noun acerto.
Acerto eletronico de chaves seems to be the translation from the english term key establishment used in computer communications. When 2 or more computers want to exchange data in a secure way, they first have to agree on a common key to be used in a cryptographic protocol. This may sound as a paradox, but there are ways to exchange secrets over a public communications channel.
As soon as the communicating computers agree on a key to use on a secure protocol, they have an acerto eletronico de chaves. Thus the most appropriate meaning from acerto as from Aulete is number 2:
2. Aquilo que se combinou; ACORDO; COMBINAÇÃO