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Zero trust security means that no one is trusted by default from inside or outside the network, and verification is required from everyone trying to gain access to resources on the network. A port scan is used to probe an IP address for open ports to identify accessible network services and applications. Automated theorem proving and other verification tools can be used to enable critical algorithms and code used in secure systems to be mathematically proven to meet their specifications. Applications are executable code, so general practice is to disallow users the power to install them; to install only those which are known to be reputable – and to reduce the attack surface by installing as few as possible. They are typically run with least privilege, with a robust process in place to identify, test and install any released security patches or updates for them. After decades of private-sector organizations more or less being left to deal with cyber incidents on their own, the scale

The oldest known paintings are approximately 40,000 years old, found in both the Franco-Cantabrian region in western Europe, and in the caves in the district of Maros . In November 2018, however, scientists reported the discovery of the then-oldest known figurative art painting, over 40,000 years old, of an unknown animal, in the cave of Lubang Jeriji Saléh on the Indonesian island of Borneo . In December 2019, figurative cave paintings depicting pig hunting in the Maros-Pangkep karst in Sulawesi were estimated to be even older, at at least 43,900 years old. The finding was noted to be “the oldest pictorial record of storytelling and the earliest figurative artwork in the world”. Moreover, the use of language is only an abstraction for a color equivalent. The word "red", for example, can cover a wide range of variations from the pure red of the visible spectrum of light. There is not a formalized register of different colors in the way that there is agreement on different