ENGINEERING PROJECTS HUB

TOPIC:

Ring Oscillator Influenced OTP Generation for Wi-Fi Authentication using Captive Portal

TEAM MEMBERS:

Jayaraman S

Naveen Kumar G

Gowtham S

GUIDE:

Dr.R.Sundararaman, AP – III, SEEE, SASTRA Deemed University

ABSTRACT:

• To implement a Ring Oscillator based OTP authentication system for  WI-FI access
• The random number is generated using Ring Oscillator implemented through logic gates in PCB
• Captive Portal is provided by NodeMcu
• GSM Module is Interfaced with NodeMcu to send OTP through SMS
• To test the randomness of OTP using NIST analysis

PROJECT OVERVIEW:

• Nowadays many public places like railway station, restaurant, malls, etc. are providing
  free internet access through Wi-Fi
• Hackers may use this Wi-Fi to do some illegal activities
• To prevent this, OTP authentication mechanisms have been adopted
• So this project is proposing a working model using ring oscillator influenced OTP generation for Wi-Fi authentication
• The prototype consists of a ring oscillator, NodeMCU, and GSM module. The captive
  portal is established using NodeMCU
• When an unauthenticated client connects to the network, the captive portal redirects all the HTTP/HTTPS traffic from the unauthenticated client to the authenticating server through the switch
• To authenticate it, mobile number is requested on this webpage
• The NodeMCU reads the random bits generated using the chaotic ring oscillator and
  then it packs the generated random bits into the required number of OTP
• And finally sends it to the requested mobile number using the GSM module which is interfaced with NodeMCU
• When the user enters the received OTP, it will be checked with the generated OTP in the NodeMCU and
  the internet access will be provided
• The main property of chaotic oscillator is the uncertainty through the clock jitters, which causes the unpredictability in random number generation

CONNECTIONS:

• Chaotic Oscillator should be initiated for few seconds to start oscillation
• So from pin D3, a high input is provided for 5 secs and then the input bits are received from Pin D2
• GSM module is connected to pins D5 and D6

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