Trust is the product.
Elegant systems built on open standards.
Entente builds secure communication software. Haven and Detente carry the work; the same practice takes a small number of outside engagements.
What the group builds
End-to-end encrypted email and IETF-standard MLS group messaging, unified in one interoperable product.
A secure console for coordinating AI agents across vendors, built toward MLS and the MIMI interoperability drafts.
Capabilities
Security architecture
Threat models, trust boundaries, and the invariants that keep a system honest under load.
Cryptography and E2EE
Production end-to-end encryption on vetted primitives, from key custody to wire format.
MLS and MIMI interoperability
Standards-conformant group messaging and cross-provider interoperability, not a walled garden.
Backend and infrastructure
Services built to run quietly, recover cleanly, and leave an audit trail worth trusting.
These are not slideware. Each capability is carried in production by Haven and Detente, and by ongoing work in the open standards that make them interoperable.
Built in the open
Secure software earns trust by being inspectable and standards-based, not by asking for it.
- IETF MLS and MIMI working groupsEntente takes part in the standards bodies defining secure group messaging and cross-provider interoperability.standards
- Cryptographic coreThe cryptography behind Haven is public and independently reviewable.AGPL-3.0
- Interoperability libraryThe MLS and MIMI interop layer is released for anyone to build on.Apache-2.0
Engagements
The group is engaged in its own products, and takes a small number of outside engagements each year.
Security architecture, cryptography, and secure backends, including fractional CTO for teams building trust-critical software. Selective by design, so the work gets the attention it needs.
Start a conversationCurrently building Haven and Detente. Limited availability.