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UID:ce5a2838-0eb7-4e6f-bf60-01909be0e521
X-WR-CALDESC:On 1 June 1931\, Herbert O. Yardley's book\, <i>The American B
 lack Chamber</i> was released. Yardley's work with the Black Chamber had e
 nded in 1929 when the State Department funding for the program ceased. The
  program's files were transferred to William Friedman with the Signal Inte
 lligence Service (early predecessor of NSA). Yardley was out of a job and 
 ended up writing a book that was both immensely popular and brought him ha
 rsh criticism.\n\n<i>The American Black Chamber</i> was denounced by the U
 .S. government as having given away American secrets - primarily secrets a
 bout how and when cryptanalysis had been applied — not only against likely
  adversaries\, but also against U.S. allies. This led to Public Law 37\, s
 igned by Franklin D. Roosevelt in 1933\, criminalizing any such future exp
 osure. \n\nLearn more about Yardley via the link below. And make sure to v
 isit the Black Chamber/Yardley exhibit at the National Cryptologic Museum.
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DTSTART:20251102T020000
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BEGIN:VEVENT
UID:195e2aae-392a-4f38-87e7-9032b2fd1b6b
DTSTAMP:20260424T081851Z
DESCRIPTION:On 1 June 1931\, Herbert O. Yardley's book\, <i>The American Bl
 ack Chamber</i> was released. Yardley's work with the Black Chamber had en
 ded in 1929 when the State Department funding for the program ceased. The 
 program's files were transferred to William Friedman with the Signal Intel
 ligence Service (early predecessor of NSA). Yardley was out of a job and e
 nded up writing a book that was both immensely popular and brought him har
 sh criticism.\n\n<i>The American Black Chamber</i> was denounced by the U.
 S. government as having given away American secrets - primarily secrets ab
 out how and when cryptanalysis had been applied — not only against likely 
 adversaries\, but also against U.S. allies. This led to Public Law 37\, si
 gned by Franklin D. Roosevelt in 1933\, criminalizing any such future expo
 sure. \n\nLearn more about Yardley via the link below. And make sure to vi
 sit the Black Chamber/Yardley exhibit at the National Cryptologic Museum.
DTSTART;TZID=America/New_York:20260601T000000
DTEND;TZID=America/New_York:20260601T235900
LOCATION:
SUMMARY:1931: Herbert Yardley's 'The American Black Chamber' was released.
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