William Playfair (1759-1823)
نویسندگان
چکیده
منابع مشابه
Old Calcutta (1759—1763)
Servant's wages The following is quoted from proceedings of the 21st May, 1759 Taking into consideration the united complaints of the inhabitants (of Calcutta) with respect not only to the insolence but exorbitant, wages exacted by the menial servants, and having duly weighed and considered the premises, we are of opinion that their complaints are too justly founded and loudly call for redress....
متن کاملAn Efficient Binary Playfair Algorithm Using a 4×4 Playfair Key Matrix
Playfair cipher is a digraph cipher which is not preferred now a day for two main reasons. Firstly, it can be easily cracked if there is enough text and secondly, frequency analysis of digraph is anyway possible. This paper proposes a new solution, which encrypts / decrypts each byte by applying the Playfair on its nibbles with the help of a reduced 4×4 Key matrix. This byte by byte encryption ...
متن کاملBreaking A Playfair Cipher Using Memetic Algorithm
The playfair cipher operates on pairs of letters. The cipher text is broken into group of blocks, each block contains two letters. Encryption and decryption cipher depends on key search, which is a square matrix that contains 5x5 letters. The matrix contains every letter expect letter j. In this paper the cryptanalyst a playfair is presented using search techniques. It is a Memetic Algorithm, a...
متن کاملMachine reconstruction of the Playfair cipher
A Playfair cipher is a digraph substitution, where each letter pair of the plaintext is replaced by a letter pair in the ciphertext. The chart of substitutions is summarized by the placement of letters in a table, called the Playfair square, constructed in some customary manner from a keyword. We denote a substitution of plaintext digraph cd with ciphertext digraph ab by ab− cd. There are two r...
متن کامل[Johannes Friedrich August von Esmarch. (1823-1908)].
Dirección para correspondencia: Dr. Antonio Gabriel Quintero Mojica. Instituto Nacional de Rehabilitación. Av. México-Xochimilco 289 Col Arenal de Guadalupe. C.P. 14389. Tel: 5999 1000 ext 12302 Cirujano alemán que nació en Tonning en Enero de 1823 y murió en Kiel en Febrero de 1908. Fue el primero en introducir un botiquín en el campo de batalla. Hijo de Physikus Cristian Kaspar Esmarch, inici...
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ژورنال
عنوان ژورنال: Statistical Science
سال: 1990
ISSN: 0883-4237
DOI: 10.1214/ss/1177012100