QR codes bridge physical and digital worlds with camera-scannable data.
Capabilities
- Store up to 4,296 alphanumeric characters.
- Error correction (7-30% data recovery).
- Fast scanning from any angle.
- Support URLs, text, contact cards, WiFi credentials.
Security risks
- QR phishing (quishing): Malicious codes lead to phishing sites.
- No preview: Can't see destination before scanning.
- Social engineering: Users trust QR codes too readily.
- Payment fraud: Modified codes redirect payments.
Safe practices
- Verify URL before visiting (most scanners show preview).
- Avoid scanning codes in public places (stickers over legitimate codes).
- Use scanner apps that preview URLs before opening.
- Don't scan codes for sensitive actions (payments, login).
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