Stanford Security Lunch

Welcome to Security Lunch. We host speakers from both industry and academia to give talks related to applied cryptography, and system and network security.
If you're interested in attending, please sign up for the mailing list to receive updates about upcoming talks. There is an option to join virtually on Zoom.
If you're interested in giving a talk, we would love to have you! Please find more details in the About page.
You can find the upcoming and past talks for the current quarter below. We meet every Wednesday, 12 pm in Gates 415.

Spring 2024


Abstract: Verifying where and when a digital image was taken has become increasingly difficult; this issue of image provenance is especially concerning in the realm of news media. The Coalition for Content Provenance and Authenticity (C2PA) has developed a standard to verify image provenance that relies on digital signatures produced by cameras. However, photos are usually edited before being published, and a signature on an original photo cannot be verified given only the published edited image. The C2PA proposes that editing applications digitally sign edit records, but this places enormous trust in these applications. In this talk, I will describe VerITAS, a system that uses zero-knowledge proofs (zk-SNARKs) to prove that only certain edits have been applied to a signed photo. Using such proofs means that news consumers need not trust photo editors, thereby solving the trust problem posed by the C2PA standard. While past work has created image editing proofs for photos, VerITAS is the first to do so for realistically large images (30 megapixels).

Bio: Trisha is a third year computer science PhD student at Stanford University working with Dan Boneh in the Applied Cryptography Group.