I grew up skiing in rental boots and skis, and always assumed that ski boots were supposed to hurt. However, I recently bought Nice™ ski boots, which were a total game changer! I was no longer limping in agony after a day on the slopes, and felt way more in…

Let’s try (and fail) to break RSA blind signatures today! Google One recently released a VPN service, with the goal of protecting users’ privacy as they browse the web (explainer, implementation). One interesting detail is that it uses RSA Blind Signing to decouple a user’s authentication (signing) from their internet…

Preface In this post, I will explain how the Bulletproofs zero knowledge proof protocol works, as well as talk about the confidential asset protocol and confidential smart contract language we are building using Bulletproofs. This post is a condensed version of previous talks and blog posts and our Bulletproofs library documentation…

We are excited to share our progress on extending our Bulletproofs implementation with a constraint system API which enables zero-knowledge proofs of arbitrary statements. In our previous article, we announced a pre-release of Bulletproofs 1.0, the Rust implementation of range proofs. We (Cathie Yun, Henry de Valence and Oleg Andreev)…

At Chain, we’ve been working on a pure-Rust library for Bulletproofs, which we described in a previous post. Our initial release only proved single ranges, but Bulletproofs allow aggregated range proofs. These harness the logarithmic size of the inner-product protocol to create a proof for m values that is smaller…

Efo (שם) Efo means “where” in Hebrew. Ambika is from Connecticut. Eric is from Canada. Jessica is from Washington D.C. I’m from California. On the first day at one of our schools, the principal introduces the four of us to one of the administrators. We introduce ourselves. He then asks…

Krav Maga (קְרַב מַגָּע) Krav Maga means “contact combat” in Hebrew, and is an Israeli self-defense system developed for the IDF (Israeli Defense Forces). It is known for its real-world usefulness, such as in street-fighting, and simultaneous attack and defense moves. The summer before college, I enrolled in a month-long…

Autobus (אוטובוס) Autobus means “bus” in Hebrew — pretty easy to remember! Before we departed to Israel from MIT, all the MISTI-Israel students attended a day-long retreat to learn more about the Israeli culture, history, and language. We learned about the Zionist movement, about the history and current division of…

Shabbat (שַׁבָּת) Shabbat means “rest” in Hebrew. Shabbat is also the name for the Jewish day of rest, which falls on the seventh day of the week. It is observed from before sunset on Friday to after sunset on Saturday; observant Jews refrain from work activities and spend time relaxing…