public IList<GnuKey> GetKeysForEncryption()
		{
			var crypto = new PgpCrypto(new CryptoContext());
			var keys = new List<GnuKey>();

			foreach (var key in crypto.GetPublicKeyUserIdsForEncryption())
			{
				AddGnuKeyIfUsable(key, keys);
			}

			return keys;
		}