We recently had a rainy weekend interrupt our original plans to go geocaching. Instead, I took inspiration from John Baichtel’s recent posting – Codes For Kids – to introduce my kids to ciphers.

The arena of creating secure environments in the hardware and software industries is somewhat shrouded in mystery and misunderstanding. Certainly, some types of ciphers are relatively straightforward ...

“A man is crazy who writes a secret unless he conceals it from the crowd,” wrote 13th-century philosopher Roger Bacon. Since ancient times, politicians, military leaders and even lovers have used ...