I m curious how people protect truly sensitive info when the real risk isn t AES gets broken, but it leaks during sharing, coordination, or human error over everyday channels (chat/email/cloud links).

Two examples:

• Example A (friend, anonymized):
  My friend shared a dissertation draft (epilepsy-medication research) via a folder link for quick feedback, planning to secure it later. The link got forwarded, permissions were too open, and the draft leaked. No hacking just human error + link forwarding.

• Example B (real, last 2 years):
  In Aug 2025, ICE accidentally added a random person to a group text ( Mass Text ), exposing sensitive operational details in real time. It wasn t a sophisticated breach it was a simple wrong recipient added to the thread mistake, but with serious consequences.

I m asking because I m a developer and I m currently prototyping an offline-first approach to send now, reveal later file sharing, where access can be conditional not just who has the link, but also when and where it becomes readable.