شفرة فيجنير.

Key: 1–1,000 Latin letters. Nonletters are preserved and do not advance the key. Not secure encryption.

Encode or decode Latin letters using a repeating keyword. Key: 1–1,000 Latin letters. Nonletters are preserved and do not advance the key. Not secure encryption.

ATTACKATDAWN with LEMON → LXFOPVEFRNHR