Key entry device
- this page is a stub
This page describes some aspects of the operating procedure of
the Crypto AG (Hagelin) KED-3400 key entry device, that was used to
transfer cryptographic keys and other data to an HC-3400
compatible radio, such as the Ascom/Bosch/Motorola/Cryptovox
The HC-3400 can be used for a variety of functions, including:
In case of an emergency, all data stored in the CMOS RAM of the KED-3400
can be purged by pressing the buttons |
⌫ simultaneously. This procedure is commonly
known as zeroizing. After pressing the two buttons together, the display
seeks for confirmation:
If you really want to delete all data from the KED-3400, press YES
If you do not want to delete the keys,
Once the device is cleared, it can no longer be used to program any
radios, until new data has been entered by the system manager (SYS-MAN).
The table below gives a brief set of instructions on how to use the KED-3400
to generate or enter valid cryptographic keys, and distribute them to
compatible crypto-enabled radios like the
In the description we have asumed that the
3-KEY E/A/S strategy is used.
Turn the device on by pressing
The display (1)
shows two options: COURIER and SYS-MGR. Select SYS-MGR. The device now
asks for a password. Unless it has been changed, the default password
is 3400. Enter the password and press
after which a menu will be shown:
Select EDIT. This produces a new menu with three options: UK-ID,
KEY-D and SETUP-D. Select SETUP-D
and then select OP-PA
from the menu that follows (5).
Your are now asked to enter the desired key strategy (6).
Assuming you want to use the 3-KEY strategy,
The system now asks if you want
to override the default key (7). Answer 'yes' (Y) and press
↵ again. If the display defaults to
'no' (N), press
→ before pressing
Now return to the top level menu by pressing
From the menu that appears (8),
select EDIT followed by KEY-D
and then SPARE MORE
From the menu that appears, select SEL-CKS
Now choose which key you want to replace: EXPIRED, ACTIVE
or SPARE. Once you have pressed the corresponding button,
TOP to return to the top level menu.
From this menu, press EDIT
(9) followed by
(10) to reach the EDIT KEY-DATA menu again.
You can now generate a random key by pressing
This causes the internal random number generator to create
a cryptographic key, that will be different each time the function
is selected. The resulting display will look like this (note that
the actual key will be different):
The key consists of 8 groups of 4 hexadecimal digits each.
↵ to confirm the key. The display
now changes to KEY 2. Repeat the above procedure for all 8 keys,
or less if you don't need 8 keys. Once you are done, press
TOP to go back to the top level menu.
The display now asks for a 3-digit identifier for the keys.
Enter the number and press
You are now at the top level menu again. Connect a suitable radio
to one of the sockets at the left side. Ensure that the radio is
turned ON and select SEND from the menu
followed by HC-3400 in the next menu
(17). Then select ALL to send all key and setup data
to the radio (18).
The last step should be repeated for all crypto-enabled radios that
are operated in the same network.
If all goes well, the KED-3400 should now try to connect to the radio
and deliver its data. Once this is done, the display will shows the
message DATA SENT SUCCESSFULLY. If the radio can not be contacted,
the display shows the message: CONNECTION TO HC-3400 NOT ESTABLISHED.
Check the cables, verify that the radio is crypto-capable, ensure the
radio is ON, and try again. If the problem persists, check the wiring
of the cable between the KED-3400 and the radio.
For generating or entering keys, the user needs a password, as
described above. This password is only required when accessing
function (1). For distribution of keys to the
radios, it is also possible to use the COURIER function.
After switching ON, select COURIER, then SEND:
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© Crypto Museum. Created: Saturday 24 June 2017. Last changed: Saturday, 24 February 2018 - 10:51 CET.