Sorry, you need to enable JavaScript to visit this website.

Breaking the Code -- A Graphical Exploration Using Bar Charts (Star Library)

The Caesar Shift is a translation of the alphabet; for example, a five-letter shift would code the letter a as f, b as g, ... z as e. We describe a five-step process for decoding an encrypted message. First, groups of size 4 construct a frequency table of the letters in two lines of a coded message. Second, students construct a bar chart for a reference message of the frequency of letters in the English language. Third, students create a bar chart of the coded message. Fourth, students visually compare the bar chart of the reference message (step 2) to the bar chart of the coded message (step 3). Based on this comparison, students hypothesize a shift. Fifth, students apply the shift to the coded message. After decoding the message, students are asked a series of questions that assess their ability to see patterns. The questions are geared for higher levels of cognitive reasoning. Key words: bar charts, Caesar Shift, encryption, testing hypotheses

Rating: 
0
No votes yet
Author Name: 
John Gabrosek and Michael E. Schuckers
Technical Requirements: 
Minitab or SPSS (recommended)
Comments: 
gabrosej@gvsu.edu mschucke@stat.wvu.edu
Source Code Available: 
Source Code Available
Intended User Role: 
Learner
Teacher
Resource Type: 
Copyrights: 
Yes
Cost: 
Free for All
Math Level: 

You must Login or Register to post comments.