Ключевые слова: abstract, access, blocked, business, button, closed, code, coded, collection, combination, computer, door, element, encryption, equipment, error, firewall, flat, forbidden, graphic, illustration, internet, isolated, keeper, key, keyhole, locker, modern, object, password, pictogram, privacy, private, protect, protection, safe, safety, secret, secure, secured, security, shield, sign, simple, symbol, system, web, white,