It has 6.3 Kb or something of memory. So not a lot. What `ssh-tpm-agent` does is that it simply doesn't store the keys on the TPM at all. It creates the epheme

It has 6.3 Kb or something of memory. So not a lot. What `ssh-tpm-agent` does is that it simply doesn't store the keys on the TPM at all. It creates the ephemeral SRK, then load a sealed private key back into the TPM that allows us to use it. So you can have a couple hundred SSH key pair this way.