Prominent new features of the Oracle Linux 7.4 release include support for booting the operating system on UEFI Secure Boot systems, updated OpenSSH component that supports the SHA-2 algorithm for public key signatures, addition of new NBDE security packages, along with the USBGuard framework for providing systems against USB attacks. To enhance the security of installing apps, Oracle Linux 7 Update 4 introduces the “payload_gpgcheck” option to the yum command-line package manager. Furthermore, it adds better support for high-performance web apps by introducing the http-parser package, and replaces json-c with the libfastjson package for an extra layer of performance improvements.