Curated OER
Matrices: A Secret Weapon
Students perform operations with matrices. In this algebra lesson plan, students use cryptography and cryptanalysis to solve problems. They add, subtract, and multiply matrices.
Braingle
Braingle: Cryptography Brain Teasers
Test your critical thinking skills with a variety of cryptography brain teasers, phrases or expressions "encoded in some way." Solve the teasers provided at this site, and submit your own for others to try!