So some times ago: https://en.wikipedia.org/wiki/AMD–Chinese_joint_venture
We all know Chinese government are trying to spy on people, even foreigners. And to make matters worse, China usually have a bad management for information security (look at their SSL certs), so it's possible the details may leak to hackers and being taken advantage of.
However I haven't heard any security issues related to this, so can anyone tell if Zen 1 based units are safe or not?
Storm in a teacup.
If you work in Tech you know that the licensing agreements don't give the Chinese full design access but to the high level blocks, the encryption being ripped out and replaced with the equivalent Chinese encryption blocks to support Chinese schemes. The only other thing they were given the tools to replace was the I/O. As far as I know at the time the deigns was for the Global Foundries process so only GloFo could at the time manufacture them for the Chinese. It would take an awful lot of reverse engineering to get the single core they were allowed to have made for them into any form that could be meaningfully improved upon. The only thing it had equivalent performance wise to the original Zen 1 CPU was Integer performance, everything else was sub standard to the performance of the Zen 1 and they have no access to the encryption blocks in the official Zen x86 processors you and the rest of the world are running. Details in the Chinese variant can be found in the Linux source code, as Linux is used to power the world's supercomputers and that's a goal of the Chinese with their CPUs among other things to have bragging rights to a Chinese own Supercomputer rather than just buying one from a non Chinese company.
Chinese multi core attempts have been horrendous as far as performance with dual 32 core Chinese servers which can handily be beaten by a single Ryzen 7 1800X. China may eventually get to performance parity but it will be through having to expend a fortune to get there, they didn't get a massive leg up from the AMD licensing as some think.