Username/password authentication in IOT Protocols - Step-by-Step Execution

Process Flow - Username/password authentication

Start Authentication

↓

Send Username

↓

Send Password

↓

Server Checks Credentials

↓

Access Granted

↓

End

The device sends username and password to the server, which checks them and grants or denies access.

Execution Sample

IOT Protocols

send(username)
send(password)
response = server.check(username, password)
if response == 'OK':
    access = True
else:
    access = False

This code sends username and password, then sets access based on server response.

Process Table

Step	Action	Data Sent	Server Response	Access Status
1	Send username	user123	Waiting	Unknown
2	Send password	pass456	Checking	Unknown
3	Server checks credentials	user123/pass456	OK	Unknown
4	Set access based on response	N/A	OK	Granted
5	End process	N/A	N/A	Granted

💡 Access granted after server confirms credentials are correct.

Status Tracker

Variable	Start	After Step 1	After Step 2	After Step 3	After Step 4	Final
username	None	user123	user123	user123	user123	user123
password	None	None	pass456	pass456	pass456	pass456
response	None	None	None	OK	OK	OK
access	False	False	False	False	True	True

Key Moments - 2 Insights

Why does the access status remain 'Unknown' until after the server response?

Because the system must wait for the server to check the username and password before deciding access, as shown in steps 1-3 in the execution table.

What happens if the server response is not 'OK'?

Access would be set to False, denying entry. This is implied in step 4 where access depends on the server response.

Visual Quiz - 3 Questions

Look at the execution table, what is the access status at step 3?

A Unknown

B Granted

C Denied

D Waiting

💡 Hint

Check the 'Access Status' column at step 3 in the execution table.

At which step does the server send the 'OK' response?

A Step 2

B Step 3

C Step 4

D Step 5

💡 Hint

Look at the 'Server Response' column in the execution table.

If the password sent was incorrect, how would the access status change at step 4?

A It would be 'Granted'

B It would be 'Unknown'

C It would be 'Denied'

D It would be 'Waiting'

💡 Hint

Access depends on server response; incorrect password means no 'OK' response.

Concept Snapshot

Username/password authentication flow:
1. Device sends username.
2. Device sends password.
3. Server checks credentials.
4. Server responds OK or not.
5. Access granted if OK, denied otherwise.

Full Transcript

Username/password authentication starts with the device sending the username, then the password to the server. The server checks these credentials. If they match, the server responds with OK, and access is granted. Otherwise, access is denied. This process ensures only authorized users connect.