Yes — the out-of-the-box block most suited for that is the

Secret

block. Example:

python
from prefect.blocks.system import Secret

Secret(value=private_key_pem).save("my-private-key")
key = Secret.load("my-private-key").get()

A few notes: -

Secret

is the general-purpose built-in block for sensitive values - it works fine for multi-line PEM/private key/certificate text - values are treated as secret in Prefect and not shown plainly in the UI/logs - if your cert/key is binary, you’d typically base64-encode it first before storing in

Secret

If you’re already using a cloud secret manager, these can also be a better fit: - AWS Secrets Manager via

AwsSecret

in

prefect-aws

- GCP Secret Manager via

GcpSecret

in

prefect-gcp

So the short answer is: - Use

prefect.blocks.system.Secret

for most private key certificate storage needs - use AWS/GCP secret blocks instead if you want external secret management, versioning, or centralized rotation Relevant docs: - Blocks overview - `Secret` block reference If you want, I can also show the best pattern for loading a PEM cert/key from a

Secret

block into a flow or worker process.