A spy using the VIC cipher or some other cipher based on a straddling checkerboard typically uses a mnemonic such as "a sin to err" (dropping the second "r") or "at one sir" to … Here, only the checkerboard's efficiency matters. Straddling checkerboard You are encouraged to solve this task according to the task description, using any language you may know. This was a way of converting letters into pairs of numbers, devised in classical Greek times by a thinker named Polybius. A spy using the VIC cipher or some other cipher based on a straddling checkerboard typically uses a mnemonic such as "a sin to err" (dropping the second "r") or "at one sir" to … [3.4] polybius, bifid, playfair, & straddling checkerboard ciphers * A number of new cipher techniques were developed based on the "Polybius square" or "checkerboard". Template:Mergefrom In cryptography, a straddling checkerboard is a device for converting an alphabetic plaintext into digits whilst simultaneously achieving fractionation (a simple form of information diffusion) and data compression relative to other schemes using digits. Some Checkerboard Variations A basic checkerboard, letter-optimised for English and based on the "AT ONE SIR" mnemonic, a table easily composed and wirtten out on paper. The most frequently used letters in the English language ("AEINORST") appear on the top line. However, it is important to stress that this first row can be composed of any letters, despite common conventions. The Straddling Checkerboard in the Russian version consisted of 4 lines of 10 letters to accomodate the modern Russian cyrillic alphabet and some special characters such as number letter shift, dot and comman and 'true message start'. В каком-то смысле это аналог алгоритмов, лежащих в основе zip, rar и т.п., только таблица сжатия у нас фиксированная. Please visit the one-time pad page for more information about the use of checkerboards for one-time pad encryption. Step-By-Step Below is an example of a straddling checkerboard, as well as the steps taken to complete it: Start with an 8-letter keyword, key phrase, or random combination. We shall use the keyword battle for the Straddling Checkerboard, and war for the transposition. Для этого используется сжимающая таблица (straddling checkerboard). В каком-то смысле это аналог алгоритмов, лежащих в основе zip, rar и т.п., только таблица сжатия у нас фиксированная. Furthermore, one common "key" first row is "AT ONE SIR". It also is known as a monome-dinome cipher. This is the portion of this cryptology method that translates letters into numbers. Implement functions to encrypt and decrypt a message using the straddling checkerboard method. 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