Manufactured by Phillips Usfa, it was used by by the Dutch Ministry of Foreign Affairs and the Dutch military.

The machine had a number of thumbwheels to set the daily key. On top of that a noise generator was used to add extra random key which was transmitted to the far end. When not actually encrypting data, the unit kept transmitting over the link.

Ecolex 10. Behind the door  are a number of thumb wheels which applied the daily key. This is an older version of the machine. (Courtesy Museum Verbindingsdiens)

Contributors and Credits:

1)  Museum Verbindingsdiens
2) Jan Lispet <jw.lispet(at)>
3) Henk Stegeman <h.j.stegeman(at)>

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Nov 13/10