# PyTorch starts securing plaintext TCPStore with mutual TLS and PSKs

> Source: <https://runtimewire.com/article/pytorch-tcpstore-mutual-tls-psk>
> Published: 2026-11-14 00:48:25+00:00

# PyTorch starts securing plaintext TCPStore with mutual TLS and PSKs

**Commits credited to Tristan Rice add mutual TLS, TLS 1.3 PSKs, REQUIRE-TLS, and a 10-second handshake limit to TCPStore on main, with commit activity dated November 10th-13th, 2026 and no dated merge record in the supplied sources.**

        By [RuntimeWire Staff](https://runtimewire.com/author/runtimewire-staff)
        · Published 

PyTorch has added mutual TLS and TLS 1.3 pre-shared-key authentication for TCPStore on its main branch, giving the distributed-training coordination service opt-in authentication and encryption for connections that the certificate commit describes as previously unauthenticated plaintext. Tristan Rice (@d4l3k), whose GitHub profile identifies him as a maintainer for PyTorch Distributed, is credited on both linked pull requests. The first adds mutual certificate authentication for the libuv server and blocking clients. The second adds PSK authentication and a set of fail-closed hardening rules.…