The full program is held on which allows you to change the date/time to your local time zone. For each presentation, you can find the links to the preproceedings PDF and the recorded video (when they become available).

Publishing on YouTube

In order to accommodate time differences of SAC 2021 attendees, we plan to record and publish the conference sessions, and some of the invited talks and summer school lectures on the conference YouTube channel. Your participation in the event is considered as a consent to being recorded and your video published on YouTube. If you have any concerns, please reach out to us as soon as possible.

Zoom Session

The Zoom Session for talks (separate from summer school) is available at the following link:

NB: The meeting is password protected to registered attendees. You will receive an email with the password after registration.

Time Zone

The event is designed to be held during the morning of “Pacific Canada” time zone.

Invited Talks

Sofía Celi, Cloudflare

Secure messaging is on the rise: applications want to implement it, parties want to regulate it, users want to understand it. With a broad arrange of protocols, applications and options, how do users chose the secure messaging option to use? How do they know which security properties they provide? While these initial questions focus on the security part of the secure messaging sphere and its interaction with users, the privacy part is often left out from the discourse. For many, thinking about the privacy notion is integral when talking about secure messaging; while, for others, it is an optional thought. On this talk, we will explore what privacy means in the secure messaging sphere and why we think it is vital to it. We will answer questions such as: what privacy properties are missing from this security idea? Is it only about protecting metadata? what is their impact in the real-world and its policies? Do they translate to a user interface perspective?

About the Speaker

Sofía Celi is a cryptography researcher and implementer at Cloudflare. She also currently leads the design and development of version 4 of the Off-the-Record (OTR) messaging protocol. She is very involved in helping end gender-based violence that uses digital tools in the Global South. She is interested in programming languages, compilers, usable security and privacy by design, post-quantum cryptography, and real-world applications of cryptography.

Eyal Ronen, Tel Aviv University

In recent months multiple proposals for contact tracing schemes for combating the spread of COVID-19 have been published. Many of those proposals try to implement this functionality in a decentralized and privacy-preserving manner using Bluetooth Low Energy (BLE). The different schemes provide different trade-offs between privacy, security, and explainability. We claim that different countries, with different needs and cultural norms may require different trade-offs. We present ``Hashomer'', a contact tracing scheme that has been tailored to needs and cultural norms in Israel. In this talk, we will explain the specific trade-offs we made and the different challenges we faced. Our scheme was adopted by the Israeli Ministry of Health (MoH) and released as part of the national contact tracing application --- ``Hamagen''.

About the Speaker

Dr. Eyal Ronen joined the Blavatnik School of Computer Science as a Senior Lecturer in July 2020. Previously, he was a postdoctoral researcher at the Blavatnik School of Computer Science and KU Leuven’s COSIC research group hosted by Prof. Bart Preneel. Eyal obtained his Ph.D. at the Weizmann Institute of Science under the supervision of Prof Adi Shamir. His research focuses on cybersecurity and applied cryptography. In particular, he is interested in analyzing and designing real-world implementations of cryptographic and security protocols and primitives (both in software and in hardware).

List of Accepted Papers

See List of Accepted Papers for all papers that will be in the program.