Introduction to Cryptology in Algebra 2 Classroom
Engage students in a high school Algebra 2 class by exploring cryptology concepts such as coding, hexadecimal systems, substitution ciphers, and the Vigenere cipher. The lesson plan includes activities like solving puzzles, introducing binary systems, converting to hexadecimal, and writing messages to be decoded using binary or hexadecimal. By the end of the lesson, students will have a practical understanding of cryptographic techniques and applications.
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Cryptology in an Algebra 2 Classroom
Nicole Barker CyberPDX 2016 Lesson Plan LESSON OBJECTIVES: -link coding to exponential growth functions and geometric sequences -compute decimal values of hexadecimal characters -decrypt a message given in hexadecimal -use simple substation cipher -decode the punchline to a joke using the Vigenere cipher
LESSON: LESSON: Warm up puzzle (see attached) Students will be given a baggie of puzzle pieces that complete missing terms in sequences, or match explicit formulas to given sequences.
When completed, it will look something like this:
Introduce binary system comparing it to a simple geometric sequence (1, 2, 4, 8, 16, )
Continue the talk of exponential growth, and introduce the hexadecimal system.
Show examples of how to convert to hexadecimal.
Students will now write a short message to be decoded by a partner using either binary or hexadecimal.
Introduce substitution cipher and provide examples.
Show students how to use a key to decrypt a message given using the Vigenere cipher.
Exit ticket: To find the punchline to this joke, What is a chicken s least favorite day? Decrypt using a simple substitution cipher: cyp (the key to decode is sicko) tpd cf hpufhp gw wgutf Using the Vigonere cipher, and the key sicko the punchline is: XZKNOQ (Friday)
