The OpenSSL Library supports DTLS 1.3

[Blog on OpenSSL Library]

OpenSSL 4.1, which [will be released in October 2026](https://openssl-
library.org/post/2026-05-07-future-release/), adds the Datagram Transport
Layer Security (DTLS) protocol version 1.3.

## Summary

According to the [DTLS 1.3
standard](https://datatracker.ietf.org/doc/rfc9147/):

> DTLS is deliberately designed to be as similar to TLS as possible, both to
> minimize new security invention and to maximize the amount of code and
> infrastructure reuse.

Therefore DTLS 1.3 offers many of the same [benefits of TLS
1.3](https://openssl-library.org/post/2018-09-11-release111/) compared to the
1.2 versions of those protocols. It is faster because the protocol reduces the
number of round trips during the handshake. It is also more secure because it
has removed support for outdated cryptographic algorithms. DTLS also allows
for the use of Post-Quantum Cryptography (PQC) algorithms which were
[implemented in OpenSSL 3.5](https://openssl-
library.org/post/2025-04-08-openssl-35-final-release/).



URL: https://openssl-library.org/post/2026-09-09-dtls-1.3/