A Novel Protective Framework for Defeating HTTP-Based Denial of Service and Distributed Denial of Service Attacks

Algorithm 1

Service traceback oriented architecture (STBOA) algorithm.

  Begin:

  Declare string variable called Usr

  Declare string variable called Acpt

  Declare string variable called Conn

  Declare string variable called Cokie

  Declare string variable called Rmeth

      Declare an integer variable called X

  set Usr to $hdr‘User-Agent’

  set Acpt to $hdr‘Accept’

  set Conn to $hdr‘Connection’

  set Cokie to $_COOKIE‘cookie’

  set Rmeth to $_SERVER‘REQUEST_METHOD’

  set X to GenX()

      repeat

         set Usr not null, set Acpt not null and set Conn not null

         set resp_code 200

         repeat

           Cokie set not null

                 repeat

                   set Rmeth not null

                   calculate Puzz_Solve()

                   calculate Puzz_verify()

                   calculate GenNonce()

                   calculate VerifyNonce()

                   if Puzz_Solve <> Puzz_verify

                                                            EdgeRouter_Bsn(src_ip)

                    set resp_code 403

                   if GenNonce <> VerifyNonce

                                                            EdgeRouter_Ban(src_ip)

                   set resp_code 403

                 until Rmeth set null

         until Cokie set null

until Usr set null or Acpt set null or Conn set null

  End.