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If you're asking regarding the open source project, then this depends on the configured secret provider - <https://www.pulumi.com/docs/intro/concepts/secrets/#available-encryption-providers>.

As an example, for AWS KMS uses the Advanced Encryption Standard (AES) algorithm in Galois/Counter Mode (GCM) with 256-bit secret keys.

For the Pulumi SaaS, AES 256-bit is used (backed by AWS KMS). Would be happy to help with your security review if you contact us at <mailto:support@pulumi.com|support@pulumi.com>.

Thanks! That answers it for me perfectly!