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CS306: Introduction to IT Security Fall 2020 Lecture 7: Public-key Cryptography Instructor: Nikos Triandopoulos October 20, 2020 2 7.0 Announcements CS306: Announcements u HW2 did not come – too much in view of next week’s midterm exam u Road ahead u no lecture on October 13 (next week, classes will run on Monday schedule) u

CS306: Introduction to IT Security Fall 2020 Lecture 3: Perfect Secrecy Instructor: Nikos Triandopoulos September 15, 2020 2 3.0 Announcements CS306: Lab sections schedule u labs u CS306-Lx Thursdays ZOOM ID: LAB SPECIFIC! x B C D E F time 9:30 – 10:20 11:00 – 11:50 12:30 – 13:20 14:00 – 14:50 15:30 – 16:20

CS306: Introduction to IT Security Fall 2020 Labs 5 & 6: More on Hashing Instructor: Nikos Triandopoulos October 8 & 15, 2020 2 6.5 Hash functions Cryptographic hash functions Basic cryptographic primitive u maps “objects” to a fixed-length binary strings u core security property: mapping avoids collisions input arbitrarily output long string u collision: distinct

CS306: Introduction to IT Security Fall 2020 Lecture 6: MACs & Hashing Instructor: Nikos Triandopoulos October 6, 2020 2 6.0 Announcements CS306: Other announcements u HW2 to come by Friday this week u Road ahead u no lecture on October 13 (next week, classes will run on Monday schedule) u regular lecture on October 20

CS306: Introduction to IT Security Fall 2020 Lecture 4: Ciphers in Practice (I) Instructor: Nikos Triandopoulos September 22, 2020 2 4.0 Announcements CS306: Other announcements u Homework assignment HW1 is out u due in almost two weeks: Friday, October 2 u covering perfect secrecy, classical ciphers and OTP u relevant materials u Lectures 2.2, 2.3,