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Cryptofax HC-4220
Fax encryptor

The CRYPTOFAX HC-4220 was a fax encryptor developed by Crypto AG in Switzerland in the early 1990s. It allowed facsimile messages to be sent securely by any Group 3 fax unit via standard PSTN (analogue) telephone lines, at speeds between 2400 and 14,400 baud. The HC-4220 was available from 1994 until 2002 [4] when it was replaced by its successor the HC-4221 [2] [3]. The backwards compatible HC-4221 is smaller and is still available from Crypto AG today (2011).

The HC-4220 is housed in a sturdy die-case aluminium case that consists of two parts: the main unit and a detachable control panel. The control panel consists of a 36-key rubber keypad, a 4-line LCD display and a built-in card reader at the front. Beteween the display and the keypad are 6 status LEDs.

The image on the right shows the control panel of a typical HC-4220 unit. It is shown here with a smart card present in the card reader at the front. The menu-driven unit requires passwords for system manager (SM) and operator (OP).
HC-4220 with smart-card installed

When turning the device on, it first performs a self-test. After approx. 10 seconds it is ready for use. If the battery in the controller is flat, the real-time clock (RTC) and the actual settings will have been lost. As a result, the unit resets itself to the factory defaults and the user is prompted to enter the new configuration.