Learn to use the cipher utility with confidence. This Daily Drill Down walks you through using every cipher switch and shows you exactly what happens in the real world when you use these switches.

In the context of cryptography, the un-transformed message is known as plaintext, the transformation is known as encryption and the transformed message is known as ciphertext. The encryption process ...

The Playfair cipher is an incredibLe code system that is both difficult to decrypt without a computer and easily solvable by hand. You might be familiar with the Cryptoquip in the comics section of a ...

A few months ago, GeekDad's Challenge of the Week was a lovely cipher about famous novels beginnings. I enjoyed solving it and that reminded me of a time where I was teaching younger students (12 to ...

We can use similar hypotheses and deductions to complete the square recovery to find that FINAL VICTORY is the keyphrase, written in a spiral: F I N A L H K M P V G X Z Q C E W U S T D B Y R O ...

Katie has a PhD in maths, specializing in the intersection of dynamical systems and number theory. She reports on topics from maths and history to society and animals. Katie has a PhD in maths, ...

Last month, two journalists decoded part of the famous Kryptos sculpture in front of the CIA building. It’s the latest news in the cryptography world, as ciphers continue to attract code crackers in ...

Researchers have devised a new attack that can decrypt secret session cookies from about 1 percent of the Internet's HTTPS traffic and could affect about 600 of the Internet's most visited sites, ...