SSS (cipher)

SSS (also known as the "SSS cipher" or "Schlüssel zur Selbstschutz" cipher) is a type of polygraphic substitution cipher that was used in various contexts, particularly in World War II for military communications. It is a simple substitution cipher designed to obscure the text by replacing characters with others based on a fixed system or key. In the SSS cipher, pairs of letters in the plaintext are replaced according to a predetermined substitution rate.