A checksum is a small-sized block of data derived from another block of digital data for the purpose of detecting errors that may have been introduced during its transmission or storage.
GNOME is a free and open-source desktop environment for Linux and other Unix-like operating systems.
Linux is a family of open-source Unix-like operating systems based on the Linux kernel, an operating system kernel.
Tails, or "The Amnesic Incognito Live System," is a security-focused Debian-based Linux distribution aimed at preserving Internet privacy and anonymity.