OpenSSH 9.0 Released With Hardening Against Future Quantum Computers
Written by Michael Larabel in Free Software on 8 April 2022 at 06:04 AM EDT. 11 Comments
FREE SOFTWARE --
OpenSSH 9.0 is available today as the latest version of this widely-used, open-source SSH implementation. With OpenSSH 9.0 comes new features as well as changes like scp using the SFTP protocol by default.

OpenSSH 9.0 is a big release and with it comes with a few notable changes.

First up, OpenSSH 9.0 switches scp from using the legacy SCP/RCP protocol to now using the SFTP protocol internally by default. This is a change OpenSSH had been working towards with the groundwork laid in prior releases for the scp utility to use SFTP internally.

Another notable change is OpenSSH 9.0 SSH/SSHD uses the hybrid Streamlined NTRU Prime + x25519 key exchange method by default in order to resist attacks by quantum computers in the future. OpenSSH developers are making this change now to improve security to fend off "capture now, decrypt later" attacks once quantum computers are available that have the ability to decrypt captured SSH ciphertext.


OpenSSH is improving security now ahead of more advanced quantum computers in the future.


Also a rather useful change with OpenSSH 9.0 is that the sftp-server implementation adds support for the copy-data extension to support server-side copying of files/data. The sftp utility also adds a "cp" command to allow the SFTP client to perver server-side file copies.

OpenSSH 9.0 is rounded out by a number of portability improvements, various bug fixes, and other improvements.

Downloads and more details on OpenSSH 9.0 via OpenSSH.com.
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Michael Larabel is the principal author of Phoronix.com and founded the site in 2004 with a focus on enriching the Linux hardware experience. Michael has written more than 20,000 articles covering the state of Linux hardware support, Linux performance, graphics drivers, and other topics. Michael is also the lead developer of the Phoronix Test Suite, Phoromatic, and OpenBenchmarking.org automated benchmarking software. He can be followed via Twitter or contacted via MichaelLarabel.com.

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