User accounts and permissions in Intro to Computing - Flowchart & Logic Diagram

Process Overview

User accounts and permissions control who can access a computer system and what actions they can perform. This process ensures security by checking user identity and granting rights accordingly.

Flowchart

User enters username and password

Yes No↓

Access Denied: Invalid username

Yes No↓

Check user permissions

→Access Denied: Incorrect password

Yes No↓

Allow action

→Deny action: Permission denied

This flowchart shows the step-by-step process of verifying a user's identity and permissions before allowing access or actions on a computer system.

Step-by-Step Trace - 5 Steps

Step 1: User enters username and password

Step 2: Check if username 'alice' exists

Step 3: Verify password for 'alice'

Step 4: Check if 'alice' has permission for requested action (e.g., delete file)

Step 5: Allow 'alice' to perform the action

Diagram

User Database
+----------+----------+-------------+
| Username | Password | Permissions |
+----------+----------+-------------+
| alice    | secret123| delete, read|
| bob      | pass456  | read        |
+----------+----------+-------------+

User Request --> System checks username and password --> System checks permissions --> Action allowed or denied

This diagram shows how user information is stored and how the system uses it to verify identity and permissions before allowing actions.

Flowchart Quiz - 3 Questions

What happens if the username entered does not exist?

A Access is denied immediately

B The system asks for the password anyway

C The user is allowed limited access

D The system creates a new user account

Key Result

User accounts verify identity, and permissions control what actions users can perform to keep systems secure.