Learn how to implement a classic substitution cipher in C! This step-by-step tutorial walks you through encoding and decoding ...

You can make a message secret in countless different ways. One common way is to use a substitution cipher, in which one letter is substituted for another. Another is to employ a transposition cipher, ...

The message is called the plaintext because it is the unchanged source information. Example: The cat ran away. The secret message generated is called a cipher or ciphertext and it is the encrypted ...

ROT13, a decades-old letter substitution cipher, is changing the way people discuss spoilers on social media. The cipher, which simply shifts each letter 13 places in the alphabet, turns spoilers into ...

Hannah handed me a piece of paper with the following string of letters. “Each letter stands for another one,” said Hannah. “Ooh, a substitution cipher!” I thought. But I was stumped. “Is this just one ...

“The Naibbe cipher is my attempt to find a way to encode something like Latin by hand as text that partially mimics the ...