Registration is open for the 30th USENIX Security Symposium, which takes place as a virtual event on August 11–13, 2021. Join researchers, system programmers, practitioners, system administrators, and others interested in the latest advances in the security and privacy of computer systems and networks. USENIX Security ’21 is co-located with the Seventeenth Symposium on Usable Privacy and Security (SOUPS 2021). Register for one, and get access to both! And if you join USENIX, you’ll enjoy a registration discount on USENIX Security ’21 and other virtual events throughout your membership term. Grants are also available to help assist students and individuals underrepresented in the field who wish to attend the symposium. Apply by July 28, 2021!