Section 4.8 Reference Topics

This site makes a transition from the modular arithemetic (of the last section) to writing secret codes (of this section).
http://www.math.csusb.edu/faculty/susan/modular/modular.html

This commercial site gives some idea about how cryptography is applied. The name of the company RSA is named after three mathematicians, Rivest, Shamir, and Adleman.
http://www.rsasecurity.com/

This (slightly more advanced) site discusses cryptography and PGP:
http://www.pgpi.org/doc/pgpintro/

International Association for Cryptologic Research:
http://www.iacr.org

It is even interesting to check out the National Security Agency's site:
http://www.nsa.gov/

Group Projects

For Problem G18, you might look at this site:
http://sunsite.ubc.ca/LivingMathematics/V001N01/UBCExamples/Pythagoras/pythagoras.html

For Problem G20c, you can begin your search at this site:
http://aleph0.clarku.edu/~djoyce/mathhist/babylonia.html

Links