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Other slight variants, also incorporating seriation, are described in Schick (1987) [10] and David (1996). [11]The two-square cipher is not described in some other 20th century popular cryptography books e.g. by Helen Fouché Gaines (1939) or William Maxwell Bowers (1959), although both describe the Playfair cipher and four-square cipher.
On April 17, 2006, Google launched its own Da Vinci Code-related quest, based around the release of The Da Vinci Code's film version. It was created in coordination with Sony Pictures , and was called the Da Vinci Code Google Quest, [ 1 ] an online series of puzzles with a prize offered to those who answer all 24 puzzles correctly.
Each successive letter of the message is written in a single square. If the message is written vertically, it is taken off horizontally and vice versa. After filling in 32 letters, the board is turned through 90 degrees and another 32 letters written (note that flipping the board horizontally or vertically is the equivalent).
Letter Boxed is an online word puzzle video game created by Sam Ezersky and published in 2019 (soft-launched in 2018) on The New York Times Games. [1] It was the third game published in the puzzles section on the New York Times website after the Crossword and Spelling Bee . [ 2 ]
The four-square cipher is a manual symmetric encryption technique. [1] It was invented by the French cryptographer Felix Delastelle.. The technique encrypts pairs of letters (digraphs), and falls into a category of ciphers known as polygraphic substitution ciphers.
ROT13 is a simple letter substitution cipher that replaces a letter with the 13th letter after it in the Latin alphabet. ROT13 is a special case of the Caesar cipher which was developed in ancient Rome, used by Julius Caesar in the 1st century BC. [ 1 ]
The Rail Fence cipher is a form of transposition cipher that gets its name from the way in which it is encoded. In the rail fence cipher, the plaintext is written downward and diagonally on successive "rails" of an imaginary fence, then moves up when it gets to the bottom.
Deciphering is identical to enciphering, with the ciphertext letter being located in the "left" alphabet while the corresponding plaintext letter is read from the "right" alphabet. A detailed description of the Chaocipher algorithm is available [ 4 ] as well as discussions of the deciphered plaintexts [ 6 ] and the solution to Byrne's challenge.