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
标签： monoalphabetic Playfair provides security
上传时间： 2017-05-25
上传用户：变形金刚
ist a file to programm. please laberkopf contact me not
标签： laberkopf programm contact please
上传时间： 2014-01-21
上传用户：pinksun9
System will automatically delete the directory of debug and release, so please do not put files on these two directory.
标签： automatically directory release System
上传时间： 2014-01-15
上传用户：hwl453472107
Why your source code are not be used? 1.The content is too simple 2.Is not a sourcecode or document 3.lack of files 4.Directory or platform is not correct selected 5.Description is not detailed 6.Compressed file has password 7.Sourcecode duplicate or already exist
标签： sourcecode not content source
上传时间： 2013-12-18
上传用户：dreamboy36
How to install SQL Server 2000 file containing pictures for the steps that is needed to setup the Microsoft SQL server 2000
标签： containing the pictures install
上传时间： 2017-06-07
上传用户：阿四AIR
驱动程序的打包源程序 打包成安装文件setup程序
上传时间： 2017-06-08
上传用户：songrui
FAT16 Microchip Application not for PIC24F
标签： Application Microchip FAT 24F
上传时间： 2013-12-09
上传用户：1159797854
//颜色初始化 if(!has_colors() || start_color() == ERR){ endwin() printf("Terminal does not support color.\n") exit(1) } init_pair(1, COLOR_GREEN, COLOR_BLACK) init_pair(2, COLOR_RED, COLOR_BLACK) init_pair(3, COLOR_CYAN, COLOR_BLACK) init_pair(4, COLOR_WHITE, COLOR_BLACK) init_pair(5, COLOR_MAGENTA, COLOR_BLACK) init_pair(6, COLOR_BLUE, COLOR_BLACK) init_pair(7, COLOR_YELLOW, COLOR_BLACK) //写字符串 for(i = 1 i <= 7 i++) { attron(COLOR_PAIR(i)) printw("color pair d in normal mode\n", i) } for(i = 1 i <= 7 i++) { attron(COLOR_PAIR(i) | A_BLINK | A_UNDERLINE) printw("color pair d in normal mode\n", i) }
标签： start_color has_colors Terminal endwin
上传时间： 2014-01-14
上传用户：vodssv
1.The content is too simple 2.Is not a sourcecode or document 3.lack of files 4.Directory or platform is not correct selected 5.Description is not detailed 6.Compressed file has password 7.Sourcecode duplicate or already exist
标签： sourcecode Directory document content
上传时间： 2017-06-17
上传用户：Miyuki
1.The content is too simple 2.Is not a sourcecode or document 3.lack of files 4.Directory or platform is not correct selected 5.Description is not detailed 6.Compressed file has password 7.Sourcecode duplicate or already exist
标签： sourcecode Directory document content
上传时间： 2014-01-04
上传用户：asasasas
