Data security today comes first among the tasks facing each user of a personal computer. Indeed, very often you have to protect your own developments, important information, confidential information from the eyes of strangers. Having drawn an analogy with a person’s dwelling, which protects its inhabitants from attacks by strangers, and also protects property from theft, the data stored in a computer can be represented as a kind of bunker (folder) and property stored by it (files). Each house has a door and to provide protection from strangers - a lock unlocked with a cleverly made key. In a personal computer, such a lock is access to the folder with a password, and the key is the password, respectively.
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