Cryptographic experts explain the encryption protocols Zoom uses for its record 220 million users, and what they mean for cybersecurity in the age of work-from-home and coronavirus. — In April 2020, over 4 billion people are under a form of shelter-in-place or stay-home orders worldwide due to the coronavirus pandemic.[1] With work-from-home as the new normal, videoconferencing application Zoom has become the preferred platform — experiencing a spike from an average of 10 million to 200 million daily…

In this blog series, I will describe what secure multiparty computation is, what it can be used for, how it works (to some extent), and more. — In this blog series, I will describe what secure multiparty computation is, what it can be used for, how it works (to some extent), and more. My aim is for the majority of the content to be accessible to a general reader, with some of the material requiring some but…

This is the eighth and last blog in a series aimed at explaining the growing use of MPC and threshold signing to protect cryptocurrencies. — Brief recap In the previous blog posts in this series, I described the use of MPC and threshold signing for protecting cryptocurrencies, along with its main features and properties. …

How is it possible to backup a blockchain key in a threshold signing setting, and ensure that the backup is valid, without revealing the key? — Brief recap In the previous blog posts in this series, I described the use of MPC and threshold signing for protecting cryptocurrencies, along with its main features and properties. In this post, I talk about an additional crucial feature needed — secure backup.

A new paper by researchers at KeyFactor shows how an extremely high number of RSA keys on the Internet can be completely broken, in very short time. Out of 75 million RSA certificates scraped from the Internet between 2015 and 2017, a whopping 250,000 could be completely broken. This means…

A new yet another attack on SGX, called Plundervolt, works by playing around with the clock speed and voltage to the chip in order to induce an error in the computation that can be used to extract cryptographic secret keys. To an ordinary person, this sounds extremely strange. First, how…

As with any area of modern cryptography, any MPC protocol must be proven secure relative to a specific definition of security. — Brief recap This is the sixth blog in a series aimed at explaining the growing use of MPC and threshold signing to protect cryptocurrencies. In the first five blog posts in this series, I described the use of MPC and threshold signing for protecting cryptocurrencies, along with its main features…

This is the fifth blog in a series aimed at explaining the growing use of MPC and threshold signing to protect cryptocurrencies. Brief recap In the first four blog posts in this series ( Shamir Secret Sharing and Quorums, Threshold Signature Schemes, Additional Properties of Threshold Signing, and MPC Compared…

This is the fourth blog in a series aimed at explaining the growing use of MPC and threshold signing to protect cryptocurrencies. Brief recap In the first three blog posts in this series (read Shamir Secret Sharing and Quorums, Threshold Signature Schemes, and Additional Properties of Threshold Signing), I described…