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 smartphone with a blank private notification card, representing minimal push notification privacy in encrypted messaging.
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
Address book contacts passing through a blind matching gate before reaching a private messenger.
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
Aerial view of a data center in the Netherlands, showing physical infrastructure behind messenger jurisdiction.
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
Abstract constellation of message metadata points around an encrypted message block.
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