‘I changed my Air India flight last minute. My wife thought I was on doomed plane’ Officers who cover their faces could be charged with a misdemeanor under California proposal Inside A $2.7 ...

Learn how to build a multivariate linear regression model step by step—no libraries, just pure C++ logic!

Discover how mathematicians cracked the Zodiac Killer Z340 cipher, about half a century of relentless pursuit, and why this case remains one of the most famous unsolved mysteries.

A cipher, on the other hand, is a message in which letters or symbols replace the actual letters in the message. Every cipher has a "key"—information used to decipher a message.

Zodiac Killer cipher is cracked after eluding sleuths for 51 years Northern California serial murderer sent encoded messages that went uncracked until now.

Caesar Ciphers are very simple methods of encryption because the work by shifting the alphabet over a few characters and matching up the letters (see the picture above)—in fact, if you've ever ...

For more than 200 years, buried deep within Thomas Jefferson's correspondence and papers, there lay a mysterious cipher -- a coded message that appears to have remained unsolved. Until now. The ...