How does Google Cloud External Key Manager compare to AWS KMS for BYOK?

Google Cloud EKM allows you to hold encryption keys in your own external key manager (Thales, Fortanix, etc.) while GCP uses them for encrypting Google services data. AWS KMS CloudHSM gives you dedicated HSM appliances within AWS. GCP's EKM provides stronger key custody guarantees since Google never possesses the plaintext key material. AWS CloudHSM provides similar isolation within the AWS network perimeter.

What is HashiCorp Vault Transit and how does it function as a KMS alternative?

Vault's Transit secrets engine provides encryption as a service: applications send plaintext data to Vault, receive ciphertext back, and Vault manages keys internally without ever exposing them. This pattern is similar to KMS envelope encryption but works across any cloud or on-premises. Vault Transit supports key versioning, key rotation, convergent encryption for deterministic lookup, and batch operations, making it a portable multi-cloud alternative to cloud-specific KMS.

When do I need a dedicated HSM service instead of software-based KMS?

Dedicated HSMs are required when compliance mandates FIPS 140-2 Level 3 or Level 4 key custody (PCI-HSM, ANSI X9.24), when regulations require keys never leave physical hardware, or when cryptographic operations must occur within a tamper-evident physical boundary. AWS CloudHSM, Azure Managed HSM, Thales Luna, and Entrust nShield provide dedicated HSM options beyond software KMS for these regulated workloads.

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Best Alternatives to AWS KMS

AWS Key Management Service (KMS) is a managed encryption key service providing centralized key creation, rotation, and access control for encrypting data across AWS services with HSM-backed key storage.

Top Alternatives to AWS KMS

Azure Key Vault (Keys)Google Cloud KMSOCI Vault (KMS)Alibaba KMSHashiCorp Vault (Transit)Thales CipherTrustFortanix DSMEntrust KeyControl

Frequently Asked Questions

Azure Key Vault with Managed HSM provides dedicated FIPS 140-2 Level 3 HSM custody for regulated workloads. Google Cloud KMS with External Key Manager enables BYOK where keys never leave your infrastructure. HashiCorp Vault Transit is the most flexible multi-cloud encryption as a service. Thales CipherTrust offers enterprise multi-cloud KMS with unified key governance across AWS, Azure, and GCP.

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