AWS CloudHSM Classic is backed by SafeNet's Luna HSM, current CloudHSM rely on Cavium's Nitrox, which allows for partitionable "virtual HSMs"
Meaningful control of data in distributed systems.
Keystone Enclave (QEMU + HiFive Unleashed)
A case study of vulnerability and exploitability of a HSM (in French, sorry)
Really basic overview of HSM usages
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