Cracking the Code
Day 3
Lesson Objectives
Students will use frequency analysis to determine the plaintext of a message encrypted using a monoalphabetic cipher.
Students will list the steps that can be used to break a polyalphabetic cipher.
Point to Ponder
A code is only as good as its key.
Essential Question
Does the INTERACTION between code makers (cryptographers) and code breakers (cryptanalysts) serve a good purpose or a bad one?
Students will use frequency analysis to determine the plaintext of a message encrypted using a monoalphabetic cipher.
Students will list the steps that can be used to break a polyalphabetic cipher.
Point to Ponder
A code is only as good as its key.
Essential Question
Does the INTERACTION between code makers (cryptographers) and code breakers (cryptanalysts) serve a good purpose or a bad one?
Intercepted Messages
1. Hp slgp tyepcnpaepo dzxp nzxxfytnletzy esle dszhd esp Mwlnvslhvd
lcp rztyr ez mp fdtyr l yph nzop hspy esp rlxpd mprty lrlty! Espcp htww mp yz hlj qzc fd ez fyopcdelyo hsle espj lcp dljtyr tq hp oz yze qtrfcp zfe esp vtyo zq djdepx espj htww mp fdtyr. Hp xfde nzxp fa htes l awly ez qtrfcp zfe esptc nzop! 2. Iss kvc bmerx! Uo rcoh ry jgxh mex urer dlc msbo sp mmnrip sw rrer
dlci agvp zo yqsre! Dlc Lpymofkai diyw qcwfcbw qevc kvc dvgmow! S xfsri dlci lyfi ycocn el yyr-yj-ryal qvmet ry lcvt, zex G nsl'd xfsri dlyd xfoc fkzc biaomtoh rri ayhc yv astfov wox! Uo wrspj reto xgwi! Uril dlci vcmigfi rri ayhc gi uspj kpqy rcoh ry fc dlcbi! Akr yxcmxi dsrb yyr glcbi rri Zveaulygoq kvc xsu cs rrer gi akr dypjya rrik krb pmln ssd afor rriw gmjv vcmigfi rri ayhc? |
Padlet
Use the link below to visit today's padlet to add any information you think would be important for creating a new cryptosystem!
Padlet for Day 3
You can view the project rubric to review the expectations for the project by clicking on the link below:
Final Project Rubric
Final Project Rubric
Top Secret Picture: Some rights reserved by Malakhi Helel Creative Commons license BY-ND 2.0