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Lord Playfair, who heavily promoted its use.. Playfair cipher was the first cipher to encrypt pairs of letters in cryptologic history. [2] Wheatstone invented the cipher for secrecy in telegraphy, but it carries the name of his friend Lord Playfair, first Baron Playfair of St. Andrews, who promoted its use.
Professor's Cube in scrambled state Professor's Cube in solved state. The original Professor's Cube design by Udo Krell works by using an expanded 3×3×3 cube as a mantle with the center edge pieces and corners sticking out from the spherical center of identical mechanism to the 3×3×3 cube.
The four-square cipher uses four 5 by 5 (5x5) matrices arranged in a square. Each of the 5 by 5 matrices contains the letters of the alphabet (usually omitting "Q" or putting both "I" and "J" in the same location to reduce the alphabet to fit).
Minishogi board setup. Minishogi (5五将棋 gogo shōgi "5V chess" or "5×5 chess") is a modern variant of shogi (Japanese chess). The game was invented (or rediscovered) around 1970 by Shigenobu Kusumoto of Osaka, Japan.
A signal strength and readability report is a standardized format for reporting the strength of the radio signal and the readability (quality) of the radiotelephone (voice) or radiotelegraph (Morse code) signal transmitted by another station as received at the reporting station's location and by their radio station equipment.
The first parameters are one or two letters codes (sometimes three), that specify which tile is used. Though a preceding space is OK, be sure not to leave a space after that code.
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The program was intended for RCAF pilots, a third of whom were not considered fit to fly at the time. While performing research at the University of Illinois in the early 1950s, Orban had noticed, when testing oxygen intake, that long periods of exercise did not necessarily lead to significant improvement.