Playfair Cipher 1.not even the Large number of keys in a monoalphabetic cipher provides security 2.one approach to improving security was to encrypt multiple letters 3.the Playfair Cipher is an example 4.invented by Charles Wheatstone in 1854,but named after his friend Baron Playfair Playfair Key Matrix 1.a 5X5 matrix of letters based on a keyword 2.fill in letters of keyword (sans duplicates) 3.fill rest of matrix with other letters Encrypting and Decrypting -plaintext is encrypted two letters at a time 1. if a pair is a repeated letter, insert filler like X’ 2. if both letters fall in the same row, replace each with letter to right (wrapping back to start from end) 3. if both letters fall in the same column, replace each with the letter below it (again wrapping to top from bottom) 4. otherwise each letter is replaced by the letter in the same row and in the column of the other letter of the pair
標簽： monoalphabetic Playfair provides security
上傳時間： 2017-05-25
上傳用戶：變形金剛
This is a simple algorithm that downloads trading data from yahoo database. It is basically a Large scale application of sqq.m which was originally submitted by Michael Boldin, link at acknowledgements. Some of the functionalities of the package: - User defined ticker list. - Function for downloading most recent SP500 composition in ticker list. - Control for bad data (e.g. a certain percentage of prices missing). - Choice of frequency of data (e.g. weekly prices). - Choice of starting and ending data. - Function for saving the whole data in a pre-formatted excel file together with a full reports on missing data.
標簽： algorithm downloads basically database
上傳時間： 2017-06-03
上傳用戶：啊颯颯大師的
Text clessifier NB form Large documents
標簽： clessifier documents Large Text
上傳時間： 2017-06-25
上傳用戶：chenlong
Large sclae prepocess data for data mining and code
標簽： data prepocess mining Large
上傳時間： 2013-12-27
上傳用戶：杜瑩12345
RX Library contains a Large number of components, objects and routines for Borland Delphi with full source code. This library is compatible with Borland Delphi 1, 2, 3, 4 and Borland C++ Builder 1 and 3.
標簽： components contains routines Library
上傳時間： 2013-12-30
上傳用戶：daguda
scale-free network model, Abnormally Large value(s) may cause long processing
標簽： scale-free Abnormally processing network
上傳時間： 2014-01-05
上傳用戶：watch100
this is the ADD routine for the prime field and Large numbers for ECC or RSA algorithms. with IAR version 5 or above.
標簽： algorithms for the routine
上傳時間： 2013-12-17
上傳用戶：yph853211
this is the SUB routine for the prime field and Large numbers for ECC or RSA algorithms. with IAR version 5 or above.
標簽： algorithms for the routine
上傳時間： 2017-07-25
上傳用戶：363186
this is the MONTGOMERY INV routine for the prime field and Large numbers for ECC or RSA algorithms. with IAR version 5 or above.
標簽： MONTGOMERY algorithms for the
上傳時間： 2014-01-13
上傳用戶：671145514
this is the MUL routine for the prime field and Large numbers for ECC or RSA algorithms. with IAR version 5 or above.
標簽： algorithms for the routine
上傳時間： 2013-12-20
上傳用戶：zxc23456789
