The program began with a very brief history of espionage. Then students divided themselves up into four groups to rotate through the four stations, with about 20 minutes at each station. They were:
Here students were asked to look at a picture for about 20 seconds and then remember as many details as possible. Then they did the same to a tray full of assorted objects. This led to a discussion about ways to remember things, including:
- Rhymes and songs
- Create a story
Finally, one student was chosen to dress up in disguise
while the group discussed ways this can be done.
2. The Caesar cipher
|Cutting out a tool to use with the Caesar Cipher.|
Then they used the Caesar cipher to write their own message. The Caesar cipher “is a type of substitution cipher in which each letter in the plain text is replaced by a letter some fixed number of positions down the alphabet.”
Here’s a template if you want to do this at home.
3. A transposition cipher and other hidden messages
|Working with scytales.|
The other hidden messages explored at this station were pages of print (random texts of words and paragraphs) that had been previously prepared. When students held them up to the window they discovered that there were pinholes in the paper at various words. When they wrote those words down in order from top to bottom and left to right, they had the hidden message.
4. Invisible ink
At this station students wrote with lemon juice and a baking soda solution as “invisible inks.” After letting the lemon juice dry, they used a hot iron to make the message appear. After letting the baking soda solution dry, they made the message appear by applying a little bit of purple grape juice concentrate.
|Making the lemon juice appear.|
Thanks again to the library for hosting such a wonderful program. Join us next month for a program on "Rocks and Minerals," facilitated by one of our group's families. It will be Thursday, April 5, from 3 to 5 p.m. in the Art Gallery of the Missouri River Regional Library. We hope to see you there!
|Spending time with friends.|