Protect pubring.gpg and secring.gpg

[Robert J. Hansen]

Faramir wrote:
> I am not sure if the secring.gpg file is encrypted as a whole
> "thing", or if each key is individually encrypted.

Individually.

> And I don't know how strong is that encryption (GPG supports at least
> 7 cipher algorithms, and I don't know what algo it uses to store the
> keys).

As strong as any other symmetric algorithm in GnuPG.  Stronger than you
need, in other words.