As we celebrate the triumph of open source software on its 25th anniversary, at the same time we have to acknowledge the great responsibility that its pervasiveness entails. Open source has become a vital component of a working society and there's a pressing need to secure it across the whole supply chain and beyond. In this session, we'll take the opportunity to look at three major advancements in open source security, from SBOMs and Sigstore to Confidential Computing. Open source plays a vital role in modern society given its pervasiveness in the Cloud, mobile devices, IoT, and critical infrastructure. Securing it at every step in the supply chain and beyond is of ultimate importance. As we prepare for the "next Log4Shell", there are some technologies that are emerging on the horizon, among which SBOMs, Sigstore, and Confidential Computing. In this session, we'll explore these technologies in detail. While SBOMs (Software Bill Of Materials) allow developers to track the dependencies of their software and ensure that they are using secure and reliable packages, Sigstore allows developers to verify the authenticity and integrity of open source packages, ensuring that the code has not been tampered with or compromised, Confidential Computing, on the other hand, protects code and data in use by performing computation in a hardware-based, attested Trusted Execution Environment, ensuring that sensitive code and data cannot be accessed or tampered by unauthorized parties, even if an attacker were to gain access to the computing infrastructure. SBOMs, Sigstore, and Confidential Computing provide a powerful combination to address security concerns and ensure the integrity and safety of open source software and data. They focus on “security first,” rather than perpetuating existing approaches which have typically attempted to bolt on security measures after development, or which rely on multiple semi-connected processes through the development process to provide marginal improvements to the overall security of an application and its deployment. As we celebrate the 25th anniversary of open source, these three technologies emerging represent a step forward on securing OSS across the whole supply chain and beyond. We foresee them playing a key role on minimizing the risk of vulnerabilities and protecting software and data against potential attacks, providing greater assurances for society as a whole.