There's a chalkboard here (used ~44:50):

Cryptography and Preventing Collusion in Second Price (Vickery) Auctions - Michael Rabin

https://www.youtube.com/watch?v=4cmCBVrVQqc

No chalkboard but more lectures

https://youtu.be/nbePExzSTQ0?si=KkTbwfwj5rMtQUhD&t=681 - פלאי תורת ההצפנות ויישומיה לתהליכים פיננסיים (The wonders of cryptography and financial applications)

https://www.youtube.com/watch?v=N_LG5Hcc8mM - Lecture 7 - Zero Knowledge Proofs and Applications Michael Rabin

For those interested in searching for more here's a Hebrew search string you can use: "פרופסור מיכאל רבין הרצאה" interesting enough Google and YT search yield results in English and Hebrew but possibly different ones than just searching in English.

EDIT: One more:

https://www.youtube.com/watch?v=30wkb46BE1k