"sha1"
   sequence-number = 4*3DIGIT
   seed            = 16*1(ALPHA / DIGIT)

   In augmented BNF syntax and with the definitions already provided,
   the syntax of the "init-word" response is:

   init-word-response = "init-word:" current-OTP ":" new-params ":"
                        new-OTP NL

   current-OTP     = word-64bit
   new-OTP         = word-64bit

   new-params      = algorithm SPACE sequence-number SPACE seed
   algorithm       = "md4" / "md5" / "sha1"
   sequence-number = 4*3DIGIT
   seed  