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This consists of DJB's 'Streamlined NTRU Prime' quantum-resistant cryptosystem, currently in round 3 of the NIST post-quantum key exchange competition; it's run in parallel with ordinary Curve25519, and generates a shared secret combining the output of both systems. (Hence, even if you don't trust this newfangled NTRU Prime thing at all, it's at least no _less_ secure than the kex you were using already.) As the OpenSSH developers point out, key exchange is the most urgent thing to make quantum-resistant, even before working quantum computers big enough to break crypto become available, because a break of the kex algorithm can be applied retroactively to recordings of your past sessions. By contrast, authentication is a real-time protocol, and can only be broken by a quantum computer if there's one available to attack you _already_. I've implemented both sides of the mechanism, so that PuTTY and Uppity both support it. In my initial testing, the two sides can both interoperate with the appropriate half of OpenSSH, and also (of course, but it would be embarrassing to mess it up) with each other.
This is the README for PuTTY, a free Windows and Unix Telnet and SSH
client.
PuTTY is built using CMake <https://cmake.org/>. To compile in the
simplest way (on any of Linux, Windows or Mac), run these commands in
the source directory:
cmake .
cmake --build .
Documentation (in various formats including Windows Help and Unix
`man' pages) is built from the Halibut (`.but') files in the `doc'
subdirectory using `doc/Makefile'. If you aren't using one of our
source snapshots, you'll need to do this yourself. Halibut can be
found at <https://www.chiark.greenend.org.uk/~sgtatham/halibut/>.
The PuTTY home web site is
https://www.chiark.greenend.org.uk/~sgtatham/putty/
If you want to send bug reports or feature requests, please read the
Feedback section of the web site before doing so. Sending one-line
reports saying `it doesn't work' will waste your time as much as
ours.
See the file LICENCE for the licence conditions.