1. DTTF/NB479: Jouspevdujpo up Dszquphsbqiz Nbuu Cpvufmm G-203 y8534 cpvufmm@sptf-ivmnbo.fev cpvufmm@sptf-ivmnbo.fev (It should now be obvious whether or not you are in the right classroom…)

2. CSSE/MA479: Introduction to Cryptography Matt Boutell F-203 x8534 boutell@rose-hulman.edu boutell@rose-hulman.edu

3. Agenda: Introductions to… The players The topic The course structure The course material

4. Introductions Roll call: Pronunciations and nicknames Pronunciations and nicknames Help me learn your names quickly Help me learn your names quickly You’ll share with classmates on discussion forum You’ll share with classmates on discussion forumMe: Second year at Rose Second year at Rose Taught CSSE120 (x3), 221, 230 (x4), Image Rec. (x2) Taught CSSE120 (x3), 221, 230 (x4), Image Rec. (x2) First time teaching Crypto! First time teaching Crypto! Some personal stuff... and some saved for later Some personal stuff... and some saved for later

5. What is Cryptography? Trappe and Washington, p. 3) Designing systems to communicate over non-secure channels

6. Non-secure channels AliceBob Eve EncryptDecrypt (Trappe and Washington, p. 3) Encryption Key (+1) Decryption Key (-1) plaintextCIPHERTEXT DSZQUPHSBQIZ cryptographycryptography

7. Agenda The players The topic The course structure The course material

8. What will we do? Learn theory (lecture, text, written problems) Make and break codes (programming assignments) Research something new (term project)

9. Angel Syllabus Text: highly recommended by students Text: highly recommended by students Grading, attendance, academic integrity Grading, attendance, academic integritySchedule Contains links to homeworks (first due Monday) Contains links to homeworks (first due Monday) Sign up for the 2 discussion forums Subscribe, then set up your mail to fwd to your Rose acct. Subscribe, then set up your mail to fwd to your Rose acct.

10. Agenda The players The topic The course structure The course material

11. Sherlock Holmes, The Adventure of the Dancing Men (1898) In a letter: 2 weeks later: 2 mornings later: 3 days later: 4 days later:

12. Sherlock Holmes, The Adventure of the Dancing Men (1898) Holmes’ letter:

13. Comments A simple substitution cipher Used knowledge of linguistics Issue of authentication: Sherlock masqueraded as Elsie. Sherlock masqueraded as Elsie.