Encryption Keeps Your Secrets
From Robert Brown on January 19th, 2018
"Encryption Keeps Your Secrets" is a single session suitable for grades 5 -10. The 16-minute video introduces substitution and transposition ciphers, beginning with the Cæsar Cipher. Students use a codebook, decrypt a message encrypted with the rail-fence cipher, then create a keyword substitution cipher. The accompanying handout is available as a PDF.