Search results
Results from the WOW.Com Content Network
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.
The four-square cipher is a manual symmetric encryption technique. [1] It was invented by the French cryptographer Felix Delastelle.. The technique encrypts pairs of letters (digraphs), and falls into a category of ciphers known as polygraphic substitution ciphers.
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 object is to clear the tableau in the fewest turns. As the skill level progresses, a timer appears, the grid size increases, and more similar pictures are used. The Beginner level has one 5x5 grid, Intermediate has two 6x6 grids, and Advanced has four 8x8 grids to solve per game (shamrocks, hearts, smiley faces or gumdrops).
Mathematically, edge-matching puzzles are two-dimensional. A 3D edge-matching puzzle is such a puzzle that is not flat in Euclidean space, so involves tiling a three-dimensional area such as the surface of a regular polyhedron. As before, polygonal pieces have distinguished edges to require that the edges of adjacent pieces match.
Discover the latest breaking news in the U.S. and around the world — politics, weather, entertainment, lifestyle, finance, sports and much more.
One can consider a Latin square as a complete bipartite graph in which the rows are vertices of one part, the columns are vertices of the other part, each cell is an edge (between its row and its column), and the symbols are colors. The rules of the Latin squares imply that this is a proper edge coloring.
AOL Mail welcomes Verizon customers to our safe and delightful email experience!