The undisclosed history of the Dutch governmental telex-message security 1945–1960

AbstractThe information behind the Dutch governmental telex message security 1945–1960 was stored in private hidden archives, our national General Intelligence and Security Service and the National Archive. Therefore, it became unknow information. The article describes the reasons behind the need for a national developed secure cryptosystem. But also, the obstacles and politics behind the developing and the producing of the OTP-systems at the national PTT for the Ministry of Foreign affairs and the Royal Dutch Navy. It also reveals the politics to transfer the subject cryptography to the national IT industry: Philips, which became the start of the commercial crypto industry in the Netherlands in 1957.Keywords: EcolexObermanDutch historyone time padClaude ShannonCold WarSignal CorpsWorld War II Disclosure statementNo potential conflict of interest was reported by the author(s).About the inventor as described in this documentMy father1928–1935 TU-Delft Mechanical and Electrical Engineering1936–1957 PTT1947–1980 TU-Delft1976 Prof. Oberman cycling at his department after his restart as extraordinary professor.Notes1 www.cryptomuseum.com.2 PTT was in that time a state-owned entity, the national monopolist on telecom in the Netherlands.3 A. Snijders cooperated closely with Oberman on cryptography from 1946 on at PTT and he ended up as a professor at TU-Delft.