Add blog post on Rust 1.68.2

posts/2023-03-28-Rust-1.68.2.md

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+---
+layout: post
+title: "Announcing Rust 1.68.2"
+author: The Rust Release Team
+release: true
+---
+
+The Rust team has published a new point release of Rust, 1.68.2. Rust is a
+programming language that is empowering everyone to build reliable and
+efficient software.
+
+If you have a previous version of Rust installed via rustup, you can get 1.68.2 with:
+
+```
+rustup update stable
+```
+
+If you don't have it already, you can [get `rustup`][install]
+from the appropriate page on our website, and check out the
+[detailed release notes for 1.68.2][notes] on GitHub.
+
+[install]: https://www.rust-lang.org/install.html
+[notes]: https://github.com/rust-lang/rust/blob/stable/RELEASES.md#version-1682-2023-03-28
+
+## What's in 1.68.2 stable
+
+Rust 1.68.2 addresses [GitHub's recent rotation of their RSA SSH host
+key](https://github.blog/2023-03-23-we-updated-our-rsa-ssh-host-key/), which
+happened on March 24th 2023 after their previous key accidentally leaked:
+
+* [GitHub's RSA key bundled in Cargo has been
+  updated](https://github.com/rust-lang/cargo/pull/11883), to ensure systems
+  that haven't interacted with GitHub yet won't connect trusting the leaked
+  key.
+
+* [The leaked key has been hardcoded as revoked in
+  Cargo](https://github.com/rust-lang/cargo/pull/11889), to ensure the key
+  won't be used by Cargo even on systems that still trust the key.
+
+[Support for `@revoked` entries in
+`.ssh/known_hosts`](https://github.com/rust-lang/cargo/pull/11635) (along with
+a better error message when the unsupported `@cert-authority` entries are used)
+is also included in Rust 1.68.2, as that change was a pre-requisite for
+backporting the hardcoded revocation.
+
+If you cannot upgrade to Rust 1.68.2, we recommend [following GitHub's
+instructions](https://github.blog/2023-03-23-we-updated-our-rsa-ssh-host-key/#what-you-can-do)
+on updating the trusted keys in your system. Note that the keys bundled in
+Cargo are only used if no trusted key for `github.com` is found on the system.
+
+### Contributors to 1.68.2
+
+Many people came together to create Rust 1.68.2. We couldn't have done it
+without all of you. [Thanks!](https://thanks.rust-lang.org/rust/1.68.2/)