How is it different from Caesar?

It uses a repeating keyword so each position can shift by a different amount.

No — it's a classical cipher, easily broken by modern methods.

Vigenère Cipher

Encode and decode text with a keyword cipher.

Keyword

Input

Output

Lxfopv ef rnhr

The Vigenère cipher shifts each letter by a repeating keyword. Enter a key to encode or decode.

How is it different from Caesar?: It uses a repeating keyword so each position can shift by a different amount.
Is it secure?: No — it's a classical cipher, easily broken by modern methods.