Content Moderation on End-to-End Encrypted Systems

I have a new draft article with Charles Duan, Content Moderation on End-to-End Encrypted Systems. A group of us received an NSF grant to study techniques for preventing abuse in encrypted messaging systems without compromising their privacy guarantees. Charles and I have been looking how these techniques interact with communications privacy laws, which were written decades ago, long before some of the cryptographic tools had been invented.