RiddleScanner
In this lesson we will be using a barcode scanner to get riddles from QR codes. Then, we will use a substitution cipher to decrypt the text containing the riddles.
Note: You will need to install this android barcode scanner app before starting this project. Most of you should already have it on your phones. (https://play.google.com/store/apps/details?id=com.google.zxing.client.android&hl=en)
Add these block components to your code to use the phone's barcode scanner. Note that you will need a barcode scanner installed for this to work.
We will need the following components
- TableLayout(5 columns, 2 rows),
- 10 TextBox in the TableLayout (width=20% each)
- 2 Buttons
- 4 Labels (For Decrypted_Message, and Encrypted_Message: height=20%)
- BarcodeScanner
Note: TextBoxes BeforeX-AfterX should be arranged like this in the TableLayout
Before1 Before2 Before3 Before4 Before5
After1 After2 After3 After4 After5
- Initialize a variable called message to " ".
- Call the BarcodeScanner's DoScan
When the BarcodeScanner's AfterScan occurs:
- Set the Encrypted_Message to the result of the scan.
- Set the variable message to the result of the scan.
After scanning a qr code, you should see the Encrypted message from the scan appear.
When you click the DecryptButton:
- Set the variable message to the substituted result of the Before and After textboxes, and the message variable.
- Do this 5 times, for every pair of the substitution boxes.
- Set the Decrypted_Message text to the variable message.
Use this key and QR code to test the app.
====Substitution Cipher Key====
7 = i
4 = o
1 = a
8 = w
3 = m
====Encrypted====
7’3 t1ll 8hen 7’3 y4ung 1nd 7’3 sh4rt 8hen 7’3 4ld. 8h1t 13 7?
====Decrypted====
I’m tall when I’m young and I’m short when I’m old. What am I?
```
====Substitution Cipher Key====
5 = t
8 = o
4 = n
7 = e
2 = s
```
## Problem Two:
```
====Substitution Cipher Key====
9 = a
8 = e
2 = o
1 = r
6 = w
```
## Problem Three:
```
====Substitution Cipher Key====
b = 5
l = 1
z = 2
m = 7
g = 0
Remember the encrypted characters are on the left and the decrypted characters are on the right.
## Problem Four:
<img src="https://raw.githubusercontent.com/cppignite/lessons/master/RiddleScanner/img/4.png">
====Substitution Cipher Key==== p = 1 q = 2 r = 3 z = , y = .
## Problem Five:
<img src="https://raw.githubusercontent.com/cppignite/lessons/master/RiddleScanner/img/5.png">
====Substitution Cipher Key==== 0 = a 8 = e 2 = t 1 = n 6 = h
## Problem Six:
<img src="https://raw.githubusercontent.com/cppignite/lessons/master/RiddleScanner/img/6.png">
====Substitution Cipher Key==== 8 = a 4 = o 7 = t 2 = e 0 = n
## Problem Seven:
<img src="https://raw.githubusercontent.com/cppignite/lessons/master/RiddleScanner/img/7.png">
====Substitution Cipher Key==== 9 = a 2 = e 4 = i 8 = h 1 = t
## Problem Eight:
<img src="https://raw.githubusercontent.com/cppignite/lessons/master/RiddleScanner/img/8.png">
====Substitution Cipher Key==== 5 = s 4 = t 2 = i 1 = l 9 = e
## Problem Nine:
<img src="https://raw.githubusercontent.com/cppignite/lessons/master/RiddleScanner/img/9.png">
====Substitution Cipher Key==== 9 = e 2 = a 0 = t 8 = u 3 = o
## Problem Ten:
<img src="https://raw.githubusercontent.com/cppignite/lessons/master/RiddleScanner/img/10.png">
====Substitution Cipher Key==== 2 = i 1 = t 9 = e 8 = a 0 = w
# External References:
# Stretch Goals
1. When the barcode scan finishes have the app speak the encrypted riddle to you.
2. When a decryption of the riddle is complete, have the app speak the decrypted riddle to you.
# External References:
1. [Barcode Scanner](http://ai2.appinventor.mit.edu/reference/components/sensors.html#BarcodeScanner)
# [APK Download](https://github.com/cppignite/lessons/raw/master/RiddleScanner/completed/RiddleScanner.apk)