Richard Leibler
Richard A. Leibler (March 18, 1914, Chicago, Illinois – October 25, 2003, Reston, Virginia) was an American mathematician and cryptanalyst. Richard Leibler was born in March 1914. He received his A.M. in mathematics from Northwestern University and his Ph.D. from the University of Illinois in 1939. While working at the National Security Agency, he and Solomon Kullback formulated the Kullback–Leibler divergence, a measure of similarity between probability distributions which has found important applications in information theory and cryptology. Leibler is also credited by the NSA as having opened up "new methods of attack" in the celebrated VENONA code-breaking project during 1949-1950; this may be a reference to his joint paper with Kullback, which was published in the open literature in 1951 and was immediately noted by Soviet cryptologists.

He was director of the Communications Research Division at the Institute for Defense Analyses from 1962 to 1977. He was inducted into the NSA Hall of Honor for his efforts against the VENONA code.
Q1297
Chicago, Illinois
LOC
Q1375280
Reston, Virginia
LOC
Q170790
mathematician
Concept
Q897511
cryptanalyst
Concept
Q309350
Northwestern University
LOC
Q457281
University of Illinois
ORG
Q121194
National Security Agency
Concept
Q896641
Solomon Kullback
PER
Q255166
Kullback–Leibler divergence
Concept
Q131222
information theory
Concept
Q8789
cryptology
Concept
Q696328
VENONA
Concept
None
Communications Research Division at the Institute for Defense Analyses
UNK
Q1571346
NSA Hall of Honor
PER
Q2150086
Richard Leibler
PER
1914-03-18T00:00:00Z^^http://www.w3.org/2001/XMLSchema#dateTime
March 18, 1914
DATE
2003-10-25T00:00:00Z^^http://www.w3.org/2001/XMLSchema#dateTime
October 25, 2003
DATE
1914-03-01T00:00:00Z^^http://www.w3.org/2001/XMLSchema#dateTime
March 1914
DATE
1939-01-01T00:00:00Z^^http://www.w3.org/2001/XMLSchema#dateTime
1939
DATE
1949-01-01T00:00:00Z^^http://www.w3.org/2001/XMLSchema#dateTime
1949
DATE
1951-01-01T00:00:00Z^^http://www.w3.org/2001/XMLSchema#dateTime
1951
DATE
1962-01-01T00:00:00Z^^http://www.w3.org/2001/XMLSchema#dateTime
1962
DATE
1977-01-01T00:00:00Z^^http://www.w3.org/2001/XMLSchema#dateTime
1977
DATE
-1950^^http://www.w3.org/2001/XMLSchema#decimal
-1950
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