Re:Announcing gopass – A 'pass' compatible password manager ...
by hackcasual on Thursday February 02, 2017 @07:05PM
(#13556331)
There is an attack against RSA if you encrypt very small values with a small exponent and insecure padding. GPG generates a large symmetric encryption key, and uses that to encrypt the message, uses 65537 (as is considered good practice) as its exponent, and uses a cryptographically appropriate PKCS#1v1.5 padding scheme
As far as I'm aware, there's no reduction in security by encrypting to multiple public keys (other than increased risk of compromising one of the keys).
Afaik supplying multiple ids to gpg simply re-encryps the same symmetric key for multiple recipients - the plaintext is turned into a single cipher text.