Kirill Abrams

Kirill Abrams's personal blog

Founder & CEO, UmbrellaX TOO

This is where I write about end-to-end encryption, post-quantum cryptography, jurisdictional risk, and the design decisions behind UmbrellaX. Personal opinions, not press releases.

More about me .com

Jurisdiction Metadata briefings

I collect UmbrellaX analysis on jurisdiction metadata here, with source-backed context and links to the most useful related articles.
A person chooses the scope and duration of location sharing on a phone.
Explainers

Location sharing privacy for messengers

A founder's guide to location sharing privacy in encrypted messengers: precise GPS, live sharing, consent, storage, and UmbrellaX defaults.

Jul 28 guide 5 min New
A person reviews a link-preview request before sharing a web address.
Explainers

Link preview privacy in encrypted messengers

A founder's guide to link preview privacy: URL fetches, IP leaks, operator knowledge, caching, and the UmbrellaX design test.

Jul 23 guide 5 min New
A person chooses selected photos instead of granting access to an entire photo library.
Explainers

Messaging app permissions: privacy test

A founder's guide to messaging app permissions, what to deny, and how UmbrellaX treats device access as a narrow privacy boundary.

Jul 21 guide 5 min New
A photographer checks location and other hidden photo details before sharing.
Metadata

Photo metadata privacy in encrypted messengers

A founder's guide to photo metadata privacy, EXIF location leaks, original-file tradeoffs, and UmbrellaX media stripping defaults before sensitive sharing.

Jul 16 guide 5 min New
A person adjusts read-receipt settings to control when a conversation reveals attention.
Explainers

Read receipts privacy in encrypted messengers

Read receipts can expose attention, timing, and device state. A founder's guide to safer receipt design in encrypted messengers like UmbrellaX.

Jul 14 guide 5 min New
A phone displays a limited lock-screen notification in a shared meeting space.
Explainers

Push notification privacy for encrypted messengers

A founder's guide to push notification privacy, what Apple or Google may see before a private chat opens, and why UmbrellaX keeps push quiet by design.

Jul 9 guide 5 min New
A person chooses an invitation link instead of syncing an entire address book.
Explainers

Contact discovery privacy in messengers

A founder's guide to contact discovery privacy: address-book upload, social graphs, blind matching, and why UmbrellaX keeps discovery optional.

Jun 16 guide 5 min New
A reader reviews Kazakhstan operator jurisdiction beside a diagram of content and retained records.
Explainers

Messenger jurisdiction: privacy risk guide

A founder's guide to messenger jurisdiction: Five Eyes pressure, CLOUD Act risk, metadata, legal requests, and why UmbrellaX minimizes operator data.

Jun 11 guide 5 min New
A researcher points to timing, connection and device metadata beside encrypted message content.
Metadata

Private messenger metadata: what E2EE hides

A founder's guide to private messenger metadata: what encryption does not hide, why logs matter, and how UmbrellaX reduces operator knowledge.

May 26 pillar 5 min New