[AWildC182]

Why did Yubikey ever close source their firmware? It's really saddening to see a company going back on that

[frankharv]

The YubiKey hardware with its integral firmware has never been open sourced.

https://www.yubico.com/blog/secure-hardware-vs-open-source/

[martin8412]

Okay - So reading through that I get two impressions. They can't release source code because they use proprietary hardware. Secondly they believe that security through obscurity is better than publishing the code for everyone to see.

[kelnos]

I doubt they keep it closed as a (dubious) security measure. Likely they believe the source gives them some sort of competitive advantage. (Not saying they're right or wrong about that, just that's likely what they believe.)

[AWildC182]

Wow... I've never read so much bullshit in one blog post. They're basically hoping that nobody who reads this has any embedded development knowledge.