# File lib/mime/type.rb, line 339
339:     def signature?
340:       case @simplified.downcase
341:         when "application/pgp-keys",
342:              "application/pgp",
343:              "application/pgp-signature",
344:              "application/pkcs10",
345:              "application/pkcs7-mime",
346:              "application/pkcs7-signature",
347:              "text/vcard"
348:           return true
349:         else
350:           return false
351:       end
352:     end