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Introduction to OTP and QR Code0%
Introduction to OTP and QR Code
Beginner12 min read•Updated: Jul 11, 2026
Introduction to OTP and QR Code (OTP और क्यूआर कोड)
With the explosive growth of online shopping, digital banking, and instant mobile payments under Digital India, understanding security tokens like OTP and matrix barcodes like QR Codes is vital for digital literacy.
Click to Zoom1. What is an OTP? (One Time Password - ओटीपी)
An OTP (One Time Password) is an automatically generated numeric or alphanumeric string of characters (typically 4 to 6 digits) that authenticates a single transaction or login session.
Key Characteristics of OTP (CCC Super Important):
- 1Dynamic (गतिशील): Unlike your permanent ATM PIN or email password (which stays the same until you change it), a fresh, unique OTP is generated for each specific transaction.
- 2Short Validity (सीमित समय): An OTP remains valid only for a short time window—typically 3 to 10 minutes—after which it automatically expires.
- 3Single Use Only: Once entered to confirm a transaction, that specific OTP becomes permanently invalid; it cannot be reused.
- 4Two-Factor Authentication (2FA): OTP acts as the second layer of security. Even if a thief steals your net banking password, they cannot steal your money without the secret OTP sent to your registered mobile number!
CRITICAL CYBER SAFETY RULE:
Never share your OTP with anyone! Bank managers, police officers, or payment customer care agents will NEVER ask for your OTP. Sharing an OTP gives the caller direct access to withdraw money from your bank account!
2. What is a QR Code? (Quick Response Code - क्यूआर कोड)
A QR Code (Quick Response Code) is a two-dimensional (2D) matrix barcode composed of black squares arranged in a square grid on a white background.
History & Invention:
- Invented in 1994 by the Japanese automotive company Denso Wave (lead engineer Masahiro Hara) to track automobile parts in Toyota factories.
- Traditional 1D barcodes (linear vertical lines) can only store about 20 numeric characters horizontally.
- 2D QR Codes can store over 7,000 numeric digits or 4,000 alphanumeric characters both horizontally and vertically!
- Position Detection Patterns: Notice the three large square finder patterns in the corners (top-left, top-right, bottom-left). They allow smartphones to scan and decode the QR code from any angle (even upside down)!
What is BharatQR?
BharatQR is a common, interoperable digital payment QR code standard developed jointly by NPCI, Visa, Mastercard, and American Express. Merchants only need to display a single BharatQR stand on their counter to accept payments from BHIM UPI, Paytm, PhonePe, Google Pay, and bank debit cards!
Interactive Quiz
Multiple Choice Questions
Question 1
What does the acronym "OTP" stand for in digital transactions?
Question 2
Who invented the QR Code in 1994?
Question 3
What is the typical validity duration of a banking transaction OTP?
Question 4
What is the primary advantage of a 2D QR Code over a traditional 1D linear barcode?
Question 5
What should you do if an unknown caller claiming to be your SBI Bank Manager asks for your OTP to "unblock your ATM card"?
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UPI, AEPS, and eWallet Concepts
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Practice Quiz
Test your understanding of this lesson with 5 questions. Each question has one correct answer.