Cryptanalysis refers to the process of analyzing information systems in order to understand hidden aspects of the systems. Cryptanalysis is used to breach cryptographic security systems and gain access to the contents of encrypted messages, even if the cryptographic key is unknown.
William Frederick Friedman was a US Army cryptographer who ran the research division of the Army's Signal Intelligence Service (SIS) in the 1930s, and parts of its follow-on services into the 1950s. In 1940, subordinates of his led by Frank Rowlett broke Japan's PURPLE cipher, thus disclosing Japanese diplomatic secrets before America's entrance into World War II.
Elizebeth Smith Friedman was an American expert cryptanalyst and author who deciphered enemy codes in both World Wars and helped solve international smuggling cases during Prohibition. Over the course of her career, she worked for the United States Treasury, Coast Guard, Navy and Army, plus the International Monetary Fund. She has been called "America's first female cryptanalyst".
Agnes Meyer Driscoll, known as "Miss Aggie" or "Madame X'", was an American cryptanalyst during both World War I and World War II and was known as “the first lady of naval cryptology."
The noise reduction coefficient is a single number value ranging from 0.0 to 1.0 that describes the average sound absorption performance of a material. An NRC of 0.0 indicates the object does not attenuate mid-frequency sounds, but rather reflects sound energy. This is more conceptual than physically achievable: even very thick concrete walls will attenuate sound and may have an NRC of 0.05. Conversely, an NRC of 1.0 indicates that the material provides an acoustic surface area that is equivalent to its physical, two-dimensional surface area. This rating is common of thicker, porous sound absorptive materials such as 2"-thick fabric-wrapped fiberglass panel. Materials can achieve NRC values greater than 1.00. This is a shortcoming of the test procedure and a limitation of how acousticians define a square unit of absorption, and not a characteristic of the material itself.
RAL or variation, may refer to:
Wallace Clement Sabine was an American physicist who founded the field of architectural acoustics. Sabine was the architectural acoustician of Boston's Symphony Hall, widely considered one of the two or three best concert halls in the world for its acoustics.
The Signal Intelligence Service (SIS) was the United States Army codebreaking division through World War II. It was founded in 1930 to compile codes for the Army. It was renamed the Signal Security Agency in 1943, and in September 1945, became the Army Security Agency. For most of the war it was headquartered at Arlington Hall, on Arlington Boulevard in Arlington, Virginia, across the Potomac River from Washington (D.C.). During World War II, it became known as the Army Security Agency, and its resources were reassigned to the newly established National Security Agency (NSA).
Sound Transmission Class is an integer rating of how well a building partition attenuates airborne sound. In the US, it is widely used to rate interior partitions, ceilings, floors, doors, windows and exterior wall configurations. Outside the US, the Sound Reduction Index (SRI) ISO index is used. The STC rating very roughly reflects the decibel reduction of noise that a partition can provide. The STC is useful for evaluating annoyance due to speech sounds, but not music or machinery noise as these sources contain more low frequency energy than speech.
Sound 80 is a recording studio in Minneapolis, Minnesota, United States founded by engineer Tom Jung and composer/musician Herb Pilhofer in 1969. Largely involved with local artists, the studio is best known for recording portions of Bob Dylan's Blood on the Tracks in 1974 and Cat Stevens' Izitso in 1977, as well as demo tapes for Prince's first album For You in 1977.
Below is a timeline of notable events related to cryptography.
The Illinois Technology and Research Corridor is a region of commerce and industry located along Interstate 88 in the Chicago metropolitan area, primarily in DuPage, Kane, and DeKalb Counties. The corridor is home to the headquarters or regional centers for many Fortune 1000 companies, several office and industrial parks, colleges and universities, research and scientific institutions, medical centers, government centers, and abundant shopping, dining, lodging, and entertainment amenities. In addition to the I-90 Golden Corridor, the I-94 Lakeshore Corridor, and the I-55 Industrial Corridor, the Illinois Technology and Research Corridor is one of the principal economic centers in suburban Chicago.
QuietRock is a brand of constrained-layer damped gypsum panels manufactured in Newark, California, by PABCO Gypsum. QuietRock was developed in 2003 by Kevin Surace and Brandon D. Tinianov, the first sound-reducing gypsum wallboard panel for use in the building construction industry. QuietRock panels are engineered to increase sound transmission loss (STL) performance and, consequently, the Sound Transmission Class (STC) rating for building partitions using sound and vibration theory.
Geneva is a city in and the county seat of Kane County, Illinois, United States. It is located on the western side of the Chicago suburbs. Per the 2020 census, the population was 21,393.
Codes and ciphers were used extensively in World War I. The decoding by British Naval intelligence of the Zimmermann telegram helped bring the United States into the war.
IIT Research Institute (IITRI), also known historically and interchangeably as IIT Research Center, is a high-technology scientific research organization and applied research laboratory located in Chicago, Illinois. Previously known as the Armour Research Foundation, the IITRI is an independent corporation that operates collaboratively with the Illinois Institute of Technology (IIT) and the U.S. Government.
Elizabeth Wells Gallup was an American educator and exponent of the Baconian theory of Shakespearean authorship.
Fabyan Villa was the home of George and Nelle Fabyan from c. 1908 to 1939. The house is notable because of its remodelling in 1907 by Frank Lloyd Wright. It was the centerpiece of the Fabyans country estate, which they named Riverbank. The Kane County Forest Preserve District of Illinois purchased the majority of the Fabyan estate in 1939, and operated the Fabyans' home as a museum off and on beginning in 1940. In 1995 Preservation Partners of the Fox Valley was enlisted to operate the site and developed the Fabyan Villa Museum into a Fabyan historic home museum, where photographs, the Fabyans' personal artifact collections, and a limited number of original furnishings, as well as the Riverbank story are shared with the public.
"Colonel" George Fabyan was a millionaire businessman who founded a private research laboratory. Fabyan's laboratory pioneered modern cryptography, though its initial findings, supporting Fabyan's belief that Francis Bacon wrote Shakespeare's plays, were later disproven by the cryptographers who trained there.
The Riverbank Publications are a series of pamphlets written by the people who worked for millionaire George Fabyan in the multi-discipline research facility he built in the early 20th century near Chicago. They were published by Fabyan, often without author credit. The publications on cryptanalysis, mostly written by William Friedman, with contributions from Elizebeth Smith Friedman and others, are considered seminal in the field. In particular, Publication 22 introduced the Index of Coincidence, a powerful statistical tool for cryptanalysis.
