About: http://webisa.webdatacommons.org/162710473

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	I can attest from personal knowledge that considerable efforts continued to be expended by governments, especially including the US, to keep their cryptosystems' designs secret for at least the next 25 years after Enigma.
http://www.w3.org/ns/prov#wasQuotedFrom	nielsenhayden.com