Kevin Wu
Security Consultant
Information security professional specializing in online privacy and data protection. Experienced in enterprise security audits and penetration testing. Deep expertise in EXIF privacy leaks, encrypted transmission, and password hashing. Dedicated to translating complex security concepts into actionable protection advice.
Articles by Kevin Wu
Is Your Image Host Link Searchable on Google? 7 Free Hosts Tested for noindex Leaks
We tested Imgur, ImgBB, Postimages, Flickr, Catbox, Google Photos, and lpic.cc view pages against robots.txt, meta robots, and X-Robots-Tag to find out which ones let your 'private' share link end up in Google search results.
Posting Your Boarding Pass Can Cost You the Account: What We Measured About QR Redaction
We generated ticket QR codes at three error-correction levels and tried four redaction methods. High-EC codes still decoded with 20% of their area blacked out, and pixelation performed identically to solid blocks. Here is the data on Klook vouchers and Booking.com confirmations, plus what actually defeats a scanner.
GDPR & Image Sharing Compliance 2026: 6 Rules Before You Post a Photo
Pay attention, this is a real case, the EU has fined individuals and companies for sharing faces without consent. Here is how GDPR and Taiwan's PDPA treat faces, plates, kids, and addresses, with consent templates.
Are Self-Destructing Links Really Safe? 2026 Cryptographic Analysis of 4 Implementations
Pay attention before you trust self-destructing links. This is a real case where key management broke the guarantee. I compare 4 implementations by cryptographic design: browser-side encryption, server deletion, TTL, and split keys.
Which Image Hosts Keep Your EXIF? 2026 Field-by-Field Test of 8 Services
Pay attention, this is a real case where a Japanese idol's EXIF GPS was used by a stalker in late 2025. I uploaded tagged photos to 8 hosts including Imgur, Postimages, and ImgBB, then dumped every metadata field.
EXIF Privacy Risks 2026: How Your Photos Leak GPS, and 5 Ways to Stop It
Pay attention, every photo carries EXIF metadata: GPS coordinates, device model, timestamp. This is a real case where a stalker used EXIF to find a home. 4 sensitive fields and 5 tested countermeasures inside.