Core Infrastructure Initiative (CII) is a renowned brand that focuses on enhancing the security of open-source software. Although CII has been replaced by the Open Source Security Foundation (OpenSSF), it continues its efforts through the OpenSSF Best Practices Working Group and the OpenSSF Securing Critical Projects Working Group. With the participation of major industry players, CII aimed to strengthen the security of crucial open-source projects.

CII's collaborative and preemptive approach emphasizes cybersecurity, utilizing shared vigilance worth millions of dollars. Some of the key projects supported by CII include Chrony, a versatile Network Time Protocol implementation, and Debian, which ensures the distribution of secure binaries using reproducible builds. In collaboration with other distributions, Debian developers aim to eliminate variations in build processes, significantly improving software security.

CII also extends support to projects like Expat, Frama-C, GnuPG, OpenSSH, and OpenSSL, enhancing their security, reliability, and performance. These projects offer essential services like stream-oriented XML parsing, source code analysis, encryption, secure communication, and robust implementation of protocols like TLS and SSL. CII's commitment to improving open-source software security makes it an invaluable asset to the industry, enabling developers and users to have greater confidence in the integrity and safety of their software