The act of building or turning something into a fortress, or making it heavily protected and difficult to penetrate.
From 'fortress' plus the '-ing' suffix to create a gerund or present participle form. This describes the ongoing action of strengthening defenses, from Latin 'fortis' (strong).
Companies use 'fortressing' when they're seriously locking down security—think of your email provider 'fortressing' your account with two-factor authentication. It's a word that jumped from medieval warfare directly into cybersecurity with barely a change in meaning!
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