Computer Security

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Across
  1. 4. Fernando _____ : "Father of the password"
  2. 6. a piece of code that is capable of copying itself and typically has a detrimental effect, such as corrupting the system or destroying data.
  3. 7. a printed or written letter or symbol.
  4. 8. not subject to threat; certain to remain or continue safe and unharmed.
Down
  1. 1. keep safe from harm or injury.
  2. 2. a secret word or phrase that must be used to gain admission to something.
  3. 3. restricts access to the full functionality or data of (a computer, mobile phone, file, etc.), especially by requiring a user to verify their identity with a passcode or other form of authentication.
  4. 5. belonging to or for the use of one particular person or group of people only.