A symmetric cipher that maps each letter of the alphabet to its reverse counterpart. For example, 'A' is replaced by 'Z', 'B' by 'Y', 'C' by 'X', and so on. It is a fixed substitution cipher, meaning ...

King Charles III's royal cipher was unveiled on Monday, Sept. 26, revealing the monogram for the United Kingdom's new monarch. The king's cipher is a monogram consisting of his first name initial, C, ...

FORT HUACHUCA, Ariz. -- When Ralph Van Deman established the War Department's intelligence organization shortly after the United States entered World War I, he was faced with the daunting task of ...

The Vigenère cipher is a polyalphabetic substitution cipher, meaning it uses multiple substitution alphabets to encrypt the text. It is an improvement over simpler ciphers like the Caesar cipher and ...