# File lib/gpgme.rb, line 1401
    def to_s
      sprintf("%s   %4d%c/%s %s\n",
              secret? ? 'ssc' : 'sub',
              length,
              pubkey_algo_letter,
              (@fingerprint || @keyid)[-8 .. -1],
              timestamp.strftime('%Y-%m-%d'))
    end