docs: @Override
      public PGPPublicKeyRingCollection getAnnouncedPublicKeys() throws IOException, PGPException {
          PGPSecretKeyRing secretKeys = getSigningKeyRing();
          PGPPublicKeyRing publicKeys = getAnyPublicKeys().getPublicKeyRing(secretKeys.getPublicKey().getKeyID());
          publicKeys = BCUtil.removeUnassociatedKeysFromKeyRing(publicKeys, secretKeys.getPublicKey());
          return new PGPPublicKeyRingCollection(Collections.singleton(publicKeys));
      }