Hacking the Global Telecommunications Network
                                    
Network Procedure Differences

The Global Telecommunications Network (GTN) is Citibanks's
international data network, which allows Citicorp customers and
personnel to access Citibank's worldwide computerized services.

Two different sign on procedures exist: Type A and Type B.  All
users except some in the U.S., must use Type B. (U.S. users: the
number you dial into and the Welcome Banner you receive determine
what sign-on procedure to follow.) Welcome banners are as
follows:

TYPE A:
WELCOME TO CITIBANK. PLEASE SIGN ON.
XXXXXXXX

@
PASSWORD =

@

TYPE B:
PLEASE ENTER YOUR ID:-1->
PLEASE ENTER YOUR PASSWORD:-2->

CITICORP (CITY NAME). KEY GHELP FOR HELP.
  XXX.XXX
 PLEASE SELECT SERVICE REQUIRED.-3->


Type A User Commands

User commands are either instructions or information you send to
the network for it to follow.  The commands available are listed
below.

User Action:  Purpose:

@ (CR)   To put you in command mode (mode in which you can put
          your currently active service on hold and ask the
          network for information, or log-off the service).
          (NOTE: This symbol also serves as the network prompt;
          see Type A messages.)

BYE (CR)  To leave service from command mode.

Continue (CR)  To return to application from command mode (off
               hold)

D (CR)         To leave service from command mode.

ID             To be recognized as a user by the network
               (beginning of sign on procedure), type ID, then a
               space and your assigned network ID.  (Usually 5 or
               6 characters long)

Status (CR)    To see a listing of network address (only from @
               prompt) you need this address when "reporting a
               problem."

Type A messages

The network displays a variety of messages on your screen which
either require a user command or provide you with information.

Screen shows:  Explanation:

@   Network prompt -- request for Network ID.

BAD PASSWORD  Network does not except your password.

<address> BUSY          The address is busy, try back later.


WELCOME TO CITIBANK.    Network welcome banner. Second line
                         provides address #
PLEASE SIGN ON.         to be used when reporting "problems."
XXX.XXX

<address> ILLEGAL       You typed in an address that doesn't
                         exist.

<address> CONNECTED     Your connection has been established.

DISCONNECTED            Your connect has been disconnected.

NOT CONNECTED           Your not connect to any service at the
                         time.


NUI REQUIRED            Enter your network user ID.

PASSWORD =              Request for your assigned password.

STILL CONNECTED         You are still connected to the service
                         you were using.

?                       Network doesn't understand your entry.


Type B User Commands and Messages

Since the Type B procedure is used with GTN dial-ups, it requires
fewer commands to control the network.  There is only 1 Type B
command.  Break plus (CR) allows you to retain connection to one
service, and connect with another. 

Screen Shows:  Explanation:

CITICORP (CITY NAME).   Network Welcome banner.  Type in service
                         address.
 PLEASE SELECT SERVICE

COM   Connection made.

DER   The port is closed out of order, or no open routes are
       available.

DISCONNECTED  You have disconnected from the service and the
               network.

ERR   Error in service selected.

INV   Error in system.

MOM   Wait, the connection is being made.

NA    Not authorized for this service.

NC    Circuits busy, try again.

NP    Check service address.

OCC   Service busy, try again.


Sign-on Procedures:

  There are two types of sign on procedures.  Type A and Type B.


Type A:

To log onto a system with type A logon procedure, the easiest way
is through Telenet.  Dial your local Telenet port.  When you
receive the "@" prompt, type in the Type-A service address (Found
later in the article) then follow the instructions from there on.

  Type-B:
    Dial the your GTN telephone #, then hit return twice.  You
will then see:

"PLEASE ENTER YOUR ID:-1->"

Type in a network ID number and hit return.

    You will then see

"PLEASE ENTER YOUR PASSWORD:-2->"

     Type in Network Password and hit return.

          Finally you will see the "CITICORP (city
          name)" welcome banner, and it will ask you to
          select the service you wish to log onto. 
          Type the address and hit return.  (A list of
          addresses will be provided later)

Trouble Shooting:

    If you should run into any problems, the Citicorp personnel
will gladly  help there "employees" with any questions.  Just
pretend you work for Citibank  and they will give you alot.  This
has been tried and tested.  Many times,  when you attempt to log
on to a system and you make a mistake with the password, the
system will give you a number to call for help.  Call it and 
tell them that you forgot your pass or something.  It usually
works, since they don't expect people to be lying to them.  If
you have any questions about  the network itself, call
305-975-5223.  It is the Technical Operations Center (TOC) in
Pompano, Florida.

Dial-Ups:

    The following list of dial-ups is for North America.  I have
a list of others, but I don't think that they would be required
by anyone.  Remember: Dial-ups require Type-B log-on procedure. 
Type-A is available on systems accessible through telenet. 

Canada Toronto       416-947-2992  (1200 Baud V.22 Modem)
U.S.A. Los Angeles   213-629-4025  (300/1200 Baud U.S.A. Modem)
       Jersey City   201-798-8500
       New York City 212-269-1274
                     212-809-1164

Service Addresses:

     The following is a VERY short list of just some of the 100's
of service addresses.  In a later issue I will publish a complete
list.

Application Name:                  Type-A         Type-B

CITIADVICE                         2240001600     CADV
CITIBANKING ATHENS                 2240004000     :30
CITIBANKING PARIS                  2240003300     :33
CITIBANKING TOKYO                  2240008100     :81
CITICASH MANAGER
 INTERNATIONAL 1 (NAFG CORP)       2240001200     CCM1
 INTERNATIONAL 7 (DFI/WELLS FARGO) 2240013700     CCM7
COMPMARK ON-LINE                   2240002000     CS4
ECONOMIC WEEK ON-LINE              2240011100     FAME1
INFOPOOL/INFOTEXT                  2240003800     IP

EXAPLE OF LOGON PROCEDURE:

THE FOLLOWING IS THE BUFFERED TEXT OF A LOG-ON TO CITIBANKING
PARIS THROUGH TELENET.

CONNECT 1200
TELENET 216 13.41

TERMINAL=VT100

@2240003300

223 90331E CONNECTED

ENTER TYPE NUMBER OR RETURN

TYPE B IS BEEHIVE DM20
TYPE 1 IS DEC VT100
TYPE A IS DEC VT100 ADV VIDEO
TYPE 5 IS DEC VT52
TYPE C IS CIFER 2684
TYPE 3 IS LSI ADM 3A
TYPE L IS LSI ADM 31
TYPE I IS IBM 3101
TYPE H IS HP 2621
TYPE P IS PERKIN ELMER 1200
TYPE K IS PRINTER KEYBOARD
TYPE M IS MAI BASIC 4
TYPE T IS TELEVIDEO 9XX
TYPE V IS VOLKER CRAIG 4404
TYPE S IS SORD MICRO WITH CBMP
RELEASE BSC9.5 - 06JUN85
FOR 300 BAUD KEY ! AND CARRIAGE RETURN
CONFIG.     K1.1-I11H-R-C-B128
ENTER TYPE NUMBER OR RETURN K

CONNECTED TO CITIBANK PARIS - CBP1 ,PORT 5