How do PGP keys work?

[Swagtoshi]

If someone posted a message like this, how would you find the public key and how would you verify the identity?


-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA512
some text
-----BEGIN PGP SIGNATURE-----

some text
-----END PGP SIGNATURE-----

[Cobalt9317]

This sort of question have been answered a multiple times already https://bitcointalk.org/index.php?topic=996318.0
For future question like this just use search function.