How to solve Columnar Transposition Cipher $.1$ without a key. Give me an example to prove your answer.

Encrypt this message: "FLY ME TO THE MOON" $.2$ with key: "SUN" using Row Transposition algorithm.

Q$3$: Encrypt the following message "GeeksforGeeksusing" using rail fence algorithm with depth equals $3$

Discuss if this statement true or false $"$ Router cipher becomes less secure when we have to encrypt longer messages".