GRETACODER 518 Encryption Device

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Made by Gretag, this encryption/decryption device was used between a modem and a terminal for almost all synchronous data communications at data rates up to 20 bits per second. Encryption and decryption was done automatically via a microprocessor.

Front view of unit lying atop of its protective styrofoam.

Rear view of unit. The clear signal connector is on the left; the ciphered signal on the right. A V.24 interface is employed.

Nameplate.

The exact purpose of the plug is not known at this time,. Perhaps it is an enabling key of some type.

All photos in this table via E-bay.