A Challenge To Lopez (Part 1)

CHRIS

"I am going to teach you another cipher today," Ms. Avi began.

Here we are again with the nose-bleeding ciphers. This was a brain-drying activity.

"Who among you is familiar with the Skytale Cipher?" she asked.

Skytale Cipher?

I think I heard that. But I am not so familiar about it.

Arya suddenly raised her hand.

"Yes, Agent 498."

She stood up very confidently before speaking, "Skytale Cipher is a transposition type. Suppose the rod allows one to write four letters around in a circle and five letters down the side of it."

"And how can we decrypt that?" she threw a follow-up question then walked in front.

I think she had a plan to ask a lot of questions today.

"To decrypt, all one must do is wrap the leather strip around the rod and read across," another confident answer from her sister.

Obviously she already knew that.

After Arya answered, she sat down and returned to her conversation wit