Summer computer holiday homework

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Across
  1. 4. refers to the illegal entry into the computer system or network
  2. 6. has 16 digits consisting of numbers and letters
  3. 8. criminal activity intended to harm anyone using a computer and an internet connection
  4. 10. this is also equal to two nibbles
  5. 12. one such rule is 1-0=1
  6. 14. an example of an antivirus software
  7. 15. also known as the left most digit
Down
  1. 1. consists of two numbers
  2. 2. this includes addition, subtraction, multiplication and division
  3. 3. it is a set of programs that disrupts the normal functioning of a computer
  4. 5. this term is also equal to 6
  5. 7. a software meant to prevent unauthorised access to your computer
  6. 9. making insults and sending threatening messages of social media
  7. 11. also known as base of a number system
  8. 13. is the use of illegal methods to get and steal money that belongs to a bank or it's customers