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ShieldFive
Zero-knowledge cloud storage, post-quantum by default
Encrypted cloud storage that encrypts files in your browser before upload, with a post-quantum default cipher (ML-KEM-1024). The server only ever sees ciphertext. EU-hosted, 20 GB free, open-source crypto you can audit. No AI, no trackers.
Hi Product Hunt, I'm Cho. I built ShieldFive solo.
I made it because the encrypted-storage tools I was using kept bolting on AI features that need to read your files. I wanted the opposite: store an encrypted blob, hand me the key, leave me alone.
What it is: your files are encrypted in your browser before they upload. The server only ever holds ciphertext. No admin override, no key escrow, no support agent who can be talked into your files.
What's actually different: the default at-rest cipher is post-quantum. ML-KEM-1024 combined with XChaCha20-Poly1305, on every upload, not a toggle you have to go find. It's aimed at "harvest now, decrypt later." The crypto is a separate Apache-2.0 library on npm, the same code that runs in your browser, so you can diff the published package against what gets served to you.
The honest part, up front:
- No external audit yet. Bootstrap-funded, it happens when revenue funds it.
- Anonymous share links are classical-only.
- Browser-only client for now.
- If you lose your password and recovery key, your data is gone. The product says so loudly.
EU-hosted, 20 GB free, no card to start. And if you ever want out, /export pulls your encrypted files and decrypts them offline with the open-source library, no ShieldFive servers needed. I ran that end to end before launching.
I wrote up the crypto design here if you want the deep version: https://dev.to/chogarcia/making-...
I'd love feedback, especially the skeptical kind. Tear into it.
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About ShieldFive on Product Hunt
“Zero-knowledge cloud storage, post-quantum by default”
ShieldFive was submitted on Product Hunt and earned 4 upvotes and 1 comments, placing #158 on the daily leaderboard. Encrypted cloud storage that encrypts files in your browser before upload, with a post-quantum default cipher (ML-KEM-1024). The server only ever sees ciphertext. EU-hosted, 20 GB free, open-source crypto you can audit. No AI, no trackers.
ShieldFive was featured in Storage (7.2k followers), Privacy (11.2k followers), Security (2.7k followers) and Vercel Day (20 followers) on Product Hunt. Together, these topics include over 14.8k products, making this a competitive space to launch in.
Who hunted ShieldFive?
ShieldFive was hunted by Cho Garcia. A “hunter” on Product Hunt is the community member who submits a product to the platform — uploading the images, the link, and tagging the makers behind it. Hunters typically write the first comment explaining why a product is worth attention, and their followers are notified the moment they post. Around 79% of featured launches on Product Hunt are self-hunted by their makers, but a well-known hunter still acts as a signal of quality to the rest of the community. See the full all-time top hunters leaderboard to discover who is shaping the Product Hunt ecosystem.
Want to see how ShieldFive stacked up against nearby launches in real time? Check out the live launch dashboard for upvote speed charts, proximity comparisons, and more analytics.
Cho Garcia