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The Playfair cipher or Playfair square or Wheatstone–Playfair cipher is a manual symmetric encryption technique and was the first literal digram substitution cipher. The scheme was invented in 1854 by Charles Wheatstone, but bears the name of Lord Playfair for promoting its use. The technique encrypts pairs of letters ( bigrams or digrams ...
The Two-square cipher, also called double Playfair, is a manual symmetric encryption technique. [1] It was developed to ease the cumbersome nature of the large encryption/decryption matrix used in the four-square cipher while still being slightly stronger than the single-square Playfair cipher . The technique encrypts pairs of letters ...
In cryptanalysis, frequency analysis (also known as counting letters) is the study of the frequency of letters or groups of letters in a ciphertext. The method is used as an aid to breaking classical ciphers . Frequency analysis is based on the fact that, in any given stretch of written language, certain letters and combinations of letters ...
U.S. Const. amend. Bose Corp. v. Consumers Union of United States, Inc., 466 U.S. 485 (1984), was a product disparagement case ultimately decided by the Supreme Court of the United States. The Court held, on a 6–3 vote, in favor of Consumers Union, the publisher of Consumer Reports magazine, ruling that proof of "actual malice" was necessary ...
According to the WHO, that includes doing the following if you live in an area where dengue is spreading: Wearing clothes that cover as much of your body as possible. Using mosquito nets that ...
The number of sexual assaults in the U.S. military is likely two to four times higher than government estimates, according to a new study out of Brown University. The study, completed by the Costs ...
John Playfair FRSE, FRS (10 [citation needed] March 1748 – 20 July 1819) was a Church of Scotland minister, remembered as a scientist and mathematician, and a professor of natural philosophy at the University of Edinburgh. He is best known for his book Illustrations of the Huttonian Theory of the Earth (1802), which summarised the work of ...
Step-by-step process for the double columnar transposition cipher. In cryptography, a transposition cipher (also known as a permutation cipher) is a method of encryption which scrambles the positions of characters ( transposition) without changing the characters themselves. Transposition ciphers reorder units of plaintext (typically characters ...