DEfO developed an implementation of the encrypted Client hello (ECH) mechanism for OpenSSL.
The DEfO project developed an implementation of the encrypted ClientHello (ECH) mechanism for OpenSSL, which is a widely used library that provides an implementation of the Transport Layer Security (TLS) protocol.
In addition to the implementation of ECH for OpenSSL, the project also developed proof-of-concept implementations of various clients and servers that use OpenSSL as a demonstration and for interoperability testing.
DEfO-2 is a continuation of this effort; the focus is upstreaming the relevant ECH code to the various projects involved. Tolerant Networks Ltd. and people from the Guardian Project are doing the work in DEfO.
Through the FOSS Sustainability Fund, DEfO will maintain and update ECH code, push ECH to more TLS projects, support developers implementing ECH, perform ongoing testing and monitoring, and flexibly repond to emergent challenges.
