Cipher

Classic encryption algorithms operating over uppercase letters, preserving punctuation and space formats.

Methods

static String transpositionCipher(String text)

Strips space sequences and maps character indices dynamically through alternating even-odd split blocks.

static String caesarCipher(String text, int shift)

Moves letter registers forward or backward along index bounds based on a positive shift value.

static String keywordCipher(String text, String keyword)

Substitutes the core alphabet based on a unique pattern created from an un-duplicated keyword.

static String giovanniCipher(String text, String keyword, String keyLetter)

An advanced keyword substitution variant that adds an alphabet-shifting offset derived from a reference key character.

Usage Example

JAVA

String original = "HELLOWORLD";
String step1 = Cipher.caesarCipher(original, 3); // "KHOORZRUog"
String step2 = Cipher.keywordCipher(original, "MYKEY");