Matthew Billington
ROT9 CIPHER
BCJH BRUNWC means “stay silent,” in a code called ROT9. That’s just one spy trick you’ll learn in this activity. Only, don’t tell anyone.
Even if you aren’t a spy (you aren’t, are you?), you probably already use cryptography, or the science of secret communication, every day. For example, when you access secure sites online. Or make an online payment. Or play open-access games.
Being connected digitally has many advantages. But people
