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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

Because oil paint dries slower than other mediums, it can be blended on the support surface with meticulous detail. This extended working time also allows for adjustments and changes to be made without having to scrape off sections of dried paint. In his Naturalis Historia, Pliny the Elder tells of a painting contest between the great Greek painter Zeuxis and his rival Parrhasius to decide who was the greatest artist. Zeuxis painted a still life of grapes that appeared so real birds flew down to peck at them. Parrhasius concealed his painting behind a curtain, and asked Zeuxis if he would please unveil it. When Zeuxis tried to pull the curtain aside it proved to be a painted illusion. Other materials can be encased or collaged into the surface, or layered, using the encaustic medium to adhere it to the surface. Modern artists have extended the practice of painting considerably to include, as one example, collage, which began with Cubism and is not painting in the strict sense. Som