nKey pair: a secret (or private) key and a public
key
nSimplified:
uIf you know the public key, you can decrypt data
encrypted with the
secret key
FUsually an encrypted hash value over a published
piece of
information; the owner is the only person who can construct
the secret. Hence this a signature
uIf you know the secret key, you can decrypt data
encrypted with the
public key
Fdata is usually an encrypted key for symmetric
cipher
nPGP uses both, DNSSEC only uses signatures