QCE Digital Solutions Unit 4: Ciphers and encryption
Students explain symmetric encryption and program the Caesar, polyalphabetic (Vigenere) and one-time pad ciphers in Python.
One content description from the full QCE Digital Solutions Unit 4 — Prototype Digital Data Exchanges journey. All 17 modules below are in that journey too, with the same content — add just these to a class, or the whole strand.
Modules (17)
1
Why data is encrypted
2
Encryption and decryption
3
Symmetric encryption
4
Caesar cipher
5
Caesar cipher wrap-around with MOD 26
6
ord() and chr() in Python
7
Testing letters with isalpha() and isupper()
8
Encrypting a message with a Caesar loop in Python
9
Decrypting a Caesar cipher in Python
10
Polyalphabetic ciphers
11
Vigenere cipher
12
Vigenere cipher in Python
13
One-time pad cipher
14
Generating a one-time pad key in Python
15
Encrypting and decrypting with a one-time pad in Python
16
The XOR cipher
17
Why a symmetric key must be shared
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