http://developer.mixi.co.jp/appli/make_request/validating_signed_requests これのRails版。 http://mixiapp.ssktkr.com/ class TopController < ApplicationController def index end MIXI_CERTIFICATE = <<END -----BEGIN CERTIFICATE----- MIICdzCCAeCgAwIBAgIJAOi/chE0MhufMA0GCSqGSIb3DQEBBQUAMDIxCzAJBgNV BAYTAkpQMREwDwYDVQQKEwhtaXhpIEluYzEQMA4GA1UEAxMHbWl4aS5qcDAeFw0w OTA0MjgwNzAyMTVaFw0xMDA0MjgwNzAyMTVaMDIxCzAJBgN