CDS Ember Encrypted Messaging Case Study

A working encrypted-messaging app designed and built in two days, safeguarded against Signal and SimpleX during testing.

Encrypted messaging · Mobile · Built in two days · tested against Signal and SimpleX · 2026

CDS designed and built a working encrypted-messaging app in two days, safeguarded against Signal and SimpleX during testing.

What it is

A working encrypted-messaging app built for privacy-first mobile use, with encryption implemented end to end.

Who it serves

Security-minded product teams exploring focused mobile communication tools.

The brief

Design and build a focused private-messaging product at speed without cutting corners on the fundamentals.

The work

Designed and built Ember in two days, implemented the encrypted-messaging behaviour and safeguarded it against Signal and SimpleX during testing, alongside the companion K Cira product concept.

The result

A working encrypted-messaging app — designed, built and tested against Signal and SimpleX inside two days.

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