Materials from an elaborate scavenger hunt I designed for the undergraduates in my cryptography course (Math 458) in 2016...

Some of the messages that were encrypted using RSA, ElGamal, and probablistic encryption:
1(a) Fenton Hall
1(b) http://cascade.uoregon.edu/spring2012/online-extras/mathematical-marvels/
6. QA99 .S56 2013
9. 103
11. TRUST ME
12. The spy says “no.” So she was not honest with Beb. 
(N.B. #9 is flawed, in that it is much easier than intended.)