Eugen Leitl wrote:

I'm looking for (cheap, PCI/USB) hardware to store secrets (private key) and
support crypto primitives (signing, cert generation). It doesn't have to be
fast, but to support loading/copying of secrets in physically secure environments, and
not generate nonextractable secret onboard. Environment is

Any suggestions?

If I may put words in your mouth, you would require a server-side public key cryptography apparatus where the long-term private key value would be subject to utmost protection available, and the signature capability is nonetheless available to some "functional area" software on an general-purpose processor with less stringen protections. Hint: the software application where a security certificate is authorized is the »functional area» software. Presumably, some key management scheme must be provided so that once a "functional area" becomes suspicious, its usage of the private key can be rovoked through a key renewal, and the private key is not at stake.

The disclosure of such system is at Be reassured that this was a preventive publication, so this design is in the public domain (and is, or should have been, prior art to US patent 6,671,804).

Such server-side cryptographic hardware is currently under development. It should take the form of a 1U operational secure device and a separate key management console, the latter ensuring that no significant secret is ever stored on a personal computer. The application is not, however, certificate signing, as your post implies. I doubt that you will find products that fits your need as I expressed them. Perhaps with lower security, notably requiring that you trust the API design and implementation between the cryptographic hardware and the functional area.



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