tag:blogger.com,1999:blog-1069009752883098184.post1596115095902071597..comments2023-10-31T11:57:08.805-04:00Comments on Spy vs Spy: CIA reveals invisible ink recipes used by WWI spiesSpy vs Spyhttp://www.blogger.com/profile/12144185360491010186noreply@blogger.comBlogger1125tag:blogger.com,1999:blog-1069009752883098184.post-16960511168399281722011-04-21T20:10:52.021-04:002011-04-21T20:10:52.021-04:00Herbert Yardley revealed all these methods in 1931...Herbert Yardley revealed all these methods in 1931 in his book The Black Chamber. The book was in response to Henry Stimson shutting down America's covert signal intelligence gathering capability. Interestingly enough, there wasn't a CIA when any of this was printed his book or these documents were produced.<br /><br /><a href="www.covertalert.com" rel="nofollow">Covert Alert</a>Anonymousnoreply@blogger.com