OpenSSH Key Shielding

On  June  21, 2019, support for SSH key shielding was intro‐
duced into the OpenBSD tree, from which the OpenSSH releases
are  derived.   SSH  key  shielding is a measure intended to
protect private keys in RAM against attacks that abuse  bugs
in  speculative execution that current CPUs exhibit

Source: OpenSSH Key Shielding


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