Across
1
Security system blocking unauthorized access
4
Instructions written for a computer
5
Interface for software to communicate
6
Input device with letter and number keys
9
Conversion of data into secret code
Down
2
Physical components of a computer
3
Organized collection of stored data
7
Program to access the internet
8
Computer model of a real-world system
10
Storage medium for digital data
11
Rules for data communication