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The final discovery was by Claude Shannon in the 1940s who recognized and proved the theoretical significance of the one-time pad system.
Shannon delivered his results in a classified report in 1945, and published them openly in 1949.
At the same time, Vladimir Kotelnikov had independently proven absolute security of the one-time pad ; his results were delivered in 1941 in a report that apparently remains classified .< ref name =" kotelnikov "> PACS numbers: 01. 10. Fv, 03. 67. Dd, 89. 70 .+ c

1.824 seconds.