This story is a supplement to the feature "Rubik's Cube Inspired Puzzles Demonstrate Math's "Simple Groups"" which was printed in the July 2008 issue of Scientific American. All three new puzzles ...

Differentially 4-uniform permutations have emerged as a cornerstone in the design of secure substitution boxes (S-boxes) for modern block ciphers. These functions are characterised by their ability to ...

Four. Three. One. Five. Two. Nothing happens. The evil genius Derango is loading a cataclysmic computer virus that, when launched, will lock the entire world out of the internet. In five minutes, no ...