Ключевые слова: access, attack, business, businessman, caution, closed, code, communication, concept, confidential, connect, connection, crime, data, education, encryption, entrance, firewall, hacker, hacking, hangs, information, learning, lock, notebook, notepad, notes, office, padlock, paper, password, person, personal, privacy, private, protect, protection, reopening, safe, safety, science, secrecy, secure, security, service, shield, symbol, system, technology, unlock,