The Arca Blog
Privacy, encryption, and your photos
Honest, jargon-free guides on keeping your most personal photos truly private — and how to tell real security from marketing.
Comparisons
The Best Private Photo Vault Apps for iPhone in 2026
A balanced buyer's guide to private photo vault apps for iPhone, with the criteria that actually matter and an honest look at the tradeoffs.
Security
Are Photo Vault Apps Actually Safe? What the Research Shows
Most photo vault apps just hide your photos behind a PIN. Security researchers have shown how little that actually protects.
Guides
How to Back Up Private Photos Without Trusting the Cloud
You can keep a real backup of your private photos without handing them to a cloud provider. The trick is to encrypt first, then store anywhere.
Guides
How to Hide Photos on iPhone: 4 Ways (and Which Is Actually Private)
Four real ways to hide photos on iPhone, an honest privacy comparison, and why hiding a photo is not the same as protecting it.
Guides
Why the iPhone Hidden Album Isn't Actually Private
The iPhone Hidden album hides photos from view, but it is discoverable, syncs to iCloud, and its lock is easy to defeat. Here is what private really means.
Privacy
If You're Forced to Unlock Your Phone: Decoy Vaults and Plausible Deniability
A locked app does not help if someone makes you open it. Here is how decoy vaults and plausible deniability change that calculation.
Security
"Military-Grade Encryption": What It Actually Means (and Doesn't)
"Military-grade encryption" is a marketing phrase, not a security guarantee. Here is what the term hides and what to ask instead.
Security
Zero-Knowledge Encryption, Explained Simply
What zero-knowledge encryption really means, why 'we can't read your data' deserves scrutiny, and the one tradeoff you have to accept.
Your photos. Truly private.
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